CA2368993C - C7 ester substituted taxanes as antitumor agents - Google Patents

Abstract

Taxanes having an ester substituent at C(7), a hydroxy substituent at C(10), and a range of C(2), C(9), C(14), and side chain substituents.

Description

BACKGROUND OF THE INVENTION
The present invention is directed to novel taxanes which have exceptional utility as antitumor agents.
The taxane family of terpenes, of which baccatin III and taxol are members, has been the subject of considerable interest in both the biological and chemical arts. Taxol itself is employed as a cancer chemotherapeutic agent and TM
possesses a broad range of tumor-inhibiting activity. Taxol has a 2'R, 3'S
configuration and the following structural formula:
AcO
CgHSCONH 0 O
OH
C6}~ O
~~-,, HO =
~~ O
wherein Ac is acetyl.
Colin et al. reported in U.S. Patent 4,814,470 that certain taxol analogs have an activity significantly greater than that of taxol. One of these analogs, commonly referred to as docetaxel, has the following structural formula:

OH
_ O
tBuOCONH 0 O H
C6H5 OI ~.
OH ~~' HO
BzOAcO O

Although taxol and docetaxel are useful chemotherapeutic agents, there are limitations on their effectiveness, including limited efficacy against certain types of cancers and toxicity to subjects when administered at various doses.
Accordingly, a need remains for additional chemotherapeutic agents with improved efficacy and less toxicity, SUMMARY OF THE INVENTION
Among the aspects of the present invention, therefore, is the provision of taxanes which compare favorably to taxol and docetaxel with respect to efficacy as anti-tumor agents and with respect to toxicity. In general, these taxanes possess an ester substituent other than formate, acetate and heterosubstituted acetate at C-7, a hydroxy substituent at C-10 and a range of C-3' substituents.
Briefly, therefore, the present invention is directed to the taxane composition, per se, to pharmaceutical compositions comprising the taxane and a pharmaceutically acceptable carrier, and to methods of administration.
Other aspects and features of this invention will be in part apparent and in part pointed out hereinafter.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In one embodiment of the present invention, the taxanes of the present invention correspond to structure (1):

X5NH O R1o R9 tR 7 X

RZ O
OAc (1) wherein R2 is acyloxy;
R7 is R,aCOO-;
R7a is hydrocarbyl, substituted hydrocarbyl, or heterocyclo wherein said hydrocarbyl or substituted hydrocarbyl contains carbon atoms in the alpha and beta positions relative to the carbon of which R7a is a substituent;
R9 is keto, hydroxy, or acyloxy;
R,o is hydroxy;
R,a is hydrido or hydroxy;
X3 is substituted or unsubstituted alkyl, alkenyl, alkynyl, phenyl or heterocyclo;
XS is -COX10, -COOX,o, or -CONHX,o;
X,o is hydrocarbyl, substituted hydrocarbyl, or heterocyclo;

WO 01/57027 PCT/USOl/03385 Ac is acetyl; and R7, R9, and R,o independently have the alpha or beta stereochemical configuration.
In one embodiment, R2 is an ester (RzaC(O)O-), a carbamate (R2aR2bNC(O)O-), a carbonate (R2aOC(O)0-), or a thiocarbamate (R2aSC(O)O-) wherein R2a and R2b are independently hydrogen, hydrocarbyl, substituted hydrocarbyl or heterocyclo. In a preferred embodiment, R2 is an ester (R2aC(O)O-), wherein Rza is aryl or heteroaromatic. In another preferred embodiment, R2 is an ester (R2aC(O)O-), wherein R2a is substituted or unsubstituted phenyl, furyl, thienyl, or pyridyl. In one particularly preferred embodiment, R2 is benzoyloxy.
In one embodiment, R7 is R,aC00- wherein R7a is (i) substituted or unsubstituted C2 to C8 alkyl (straight, branched or cyclic), such as ethyl, propyl, butyl, pentyl, or hexyl; (ii) substituted or unsubstituted Cz to C$ alkenyl (straight, branched or cyclic), such as ethenyl, propenyl, butenyl, pentenyl or hexenyl;
(iii) substituted or unsubstituted C2 to C8 alkynyl (straight or branched) such as ethynyl, propynyl, butynyl, pentynyl, or hexynyl; (iv) substituted or unsubstituted phenyl; or (v) substituted or unsubstituted heteroaromatic such as furyl, thienyl, or pyridyl. The substituents may be hydrocarbyl or any of the heteroatom containing substituents identified elsewhere herein for substituted hydrocarbyl. In a preferred embodiment, R,a is ethyl, straight, branched or cyclic propyl, straight, branched or cyclic butyl, straight, branched or cyclic pentyl, straight, branched or cyclic hexyl, straight or branched propenyl, isobutenyl, furyl or thienyl. In another embodiment, R7a is substituted ethyl, substituted propyl (straight, branched or cyclic), substituted propenyl (straight or branched), substituted isobutenyl, substituted furyl or substituted thienyl wherein the substituent(s) is/are selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.
While R. is keto in one embodiment of the present invention, in other embodiments R. may have the alpha or beta stereochemical configuration, preferably the beta stereochemical configuration, and may be, for example, a-or R-hydroxy or a- or R-acyloxy. For example, when R9 is acyloxy, it may be an ester (R9aC(O)O-), a carbamate (R9aR9bNC(O)O-), a carbonate (R9aOC(O)0-), or a thiocarbamate (RgaSC(O)O-) wherein R9a and R9b are independently hydrogen, hydrocarbyl, substituted hydrocarbyl or heterocyclo. If R. is an ester (RgaC(O)O-), R9a is substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aryl or substituted or unsubstituted heteroaromatic.
Still more preferably, Rg is an ester (R9aC(O)0-), wherein R9a is substituted or unsubstituted phenyl, substituted or unsubstituted furyl, substituted or unsubstituted thienyl, or substituted or unsubstituted pyridyl. In one embodiment R. is (R9aC(O)0-) wherein R9a is methyl, ethyl, propyl (straight, branched or cyclic), butyl (straight, branched or cyclic), pentyl, (straight, branched or cyclic), or hexyl (straight, branched or cyclic). In another embodiment R9 is (R9aC(O)O-) wherein R9a is substituted methyl, substituted ethyl, substituted propyl (straight, branched or cyclic), substituted butyl (straight, branched or cyclic), substituted pentyl, (straight, branched or cyclic), or substituted hexyl (straight, branched or cyclic) wherein the substituent(s) is/are selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.
ExemplaryX3 substituents include substituted or unsubstituted CZ to C8 alkyl, substituted or unsubstituted C2 to C8 alkenyl, substituted or unsubstituted C2 to C. alkynyl, substituted or unsubstituted heteroaromatics containing 5 or 6 ring atoms, and substituted or unsubstituted phenyl. Exemplary preferred X3 substituents include substituted or unsubstituted ethyl, propyl, butyl, cyclopropyl, cyclobutyl, cyclohexyl, isobutenyl, furyl, thienyl, and pyridyl.
ExemplaryX5 substituents include -COX,o, -COOX,o or -CONHX10 wherein X,o is substituted or unsubstituted alkyl, alkenyl, phenyl or heteroaromatic.
Exemplary preferred X5 substituents include -COX,o, -COOX,o or -CONHX,o wherein X,o is (i) substituted or unsubstituted C, to C8 alkyl such as substituted or unsubstituted methyl, ethyl, propyl (straight, branched or cyclic), butyl (straight, branched or cyclic), pentyl (straight, branched or cyclic), or hexyl (straight, branched or cyclic); (ii) substituted or unsubstituted C2 to C8 alkenyl such as substituted or unsubstituted ethenyl, propenyl (straight, branched or cyclic), butenyl (straight, branched or cyclic), pentenyl (straight, branched or cyclic) or hexenyl (straight, branched or cyclic); (iii) substituted or unsubstituted C2 to C8 alkynyl such as substituted or unsubstituted ethynyl, propynyl (straight or branched), butynyl (straight or branched), pentynyl (straight or branched), or hexynyl (straight or branched); (iv) substituted or unsubstituted phenyl, or (v) substituted or unsubstituted heteroaromatic such as furyl, thienyl, or pyridyl, wherein the substituent(s) is/are selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.
In one preferred embodiment, the taxanes of the present invention 5 correspond to the following structural formula (2):

X5NH O Rlo O
X3~01 I , R7 OH ~~' HO =
BzOAcO O

(2) wherein R7 is R,aCOO-;
R,o is hydroxy;
X3 is substituted or unsubstituted alkyl, alkenyl, alkynyl, or heterocyclo;
X5 is -COX,o, -COOX,o, or -CONHX,o;
X,o is hydrocarbyl, substituted hydrocarbyl, or heterocyclo;
R,a is hydrocarbyl, substituted hydrocarbyl, or heterocyclo wherein said hydrocarbyl or substituted hydrocarbyl contains carbon atoms in the alpha and beta positions relative to the carbon of which Ra is a substituent;
Bz is benzoyl; and Ac is acetyl.

5a In one specific aspect of this embodiment, the invention provides a taxane having the general formula:

X5NH 0 Rl o R9 X3 011, s OH
R14 HO =
OAc wherein:

R2 is acyloxy;
R7 is R7aCOO - ;

R7a is hydrocarbyl, substituted hydrocarbyl, or heterocyclo wherein said hydrocarbyl or substituted hydrocarbyl contains carbon atoms in the alpha and beta positions relative to the carbon atom of which R7a is a substituent;

R9 is keto, hydroxy, or acyloxy;
Rlo is hydroxy;

R14 is hydrogen or hydroxy;

X3 is substituted or unsubstituted alkyl, alkenyl, alkynyl, or heterocyclo;

X5 is -COX10, -COOXlo, or -CONHXlo;

Xlo is hydrocarbyl, substituted hydrocarbyl, or heterocyclo; and Ac is acetyl.

75975-21(S) 5b According to one aspect of the present invention, there is provided a taxane having the general formula:

X5NH O Rlo O t5R7 Xs 011, O H HO =

OAc wherein: R2 is benzoyloxy; R7 is R7aCOO-; Rlo is hydroxy; X3 is unsubstituted Cl-C8 alkyl, C3-C8 cycloalkyl, C2-C8 alkenyl, furyl, or thienyl; X5 is -COXlo, or -COOXlo; Xio is unsubstituted C1-C8 alkyl, C3-C8 cycloalkyl, C2-C8 alkenyl, phenyl, furyl, or thienyl; R7a is unsubstituted C2-C8 alkyl or C3-C8 cycloalkyl; and Ac is acetyl.

According to another aspect of the present invention, the taxane described herein may be used to inhibit tumor growth in a mammal.

For example, in this preferred embodiment in which the taxane corresponds to structure (2), R7a may be substituted or unsubstituted ethyl, propyl or butyl, more preferably substituted or unsubstituted ethyl or propyl, still more preferably substituted or unsubstituted ethyl, and still more preferably unsubstituted ethyl. While R7a is selected from among these, in one embodiment X3 is selected from substituted or unsubstituted alkyl, alkenyl, phenyl or heterocyclo, more preferably substituted or unsubstituted alkenyl, phenyl or heterocyclo, still more preferably substituted or unsubstituted phenyl or heterocyclo, and still more preferably heterocyclo such as furyl, thienyl or pyridyl. While R7a and X3 are selected from among these, in one embodiment X5 is selected from -COX10 wherein Xlo is phenyl, alkyl or heterocyclo, more preferably phenyl.

75975-21(S) 5c Alternatively, while R7a and X3 are selected from among these, in one embodiment X5 is selected from -COX10 wherein X,o is phenyl, alkyl or heterocyclo, more preferably phenyl, or X5 is -COOX,o wherein X,o is alkyl, preferably t-butyl. Among the more preferred embodiments, therefore, are taxanes corresponding to structure 2 in which (i) is -COOX,o wherein X,o is tert-butyl or X5 is -COX,o wherein X,o is phenyl, (ii) X3 is substituted or unsubstituted cycloalkyl, alkenyl, phenyl or heterocyclo, more preferably substituted or unsubstituted isobutenyl, phenyl, furyl, thienyl, or pyridyl, still more preferably unsubstituted isobutenyl, furyl, thienyl or pyridyl, and (iii) R7a is unsubstituted ethyl or propyl, more preferably ethyl.
Among the preferred embodiments, therefore, are taxanes corresponding to structure 1 or 2 wherein R7 is R7aC00- wherein R7a is ethyl. In this embodiment, X3 is preferably cycloalkyl, isobutenyl, phenyl, substituted phenyl such as p-nitrophenyl, or heterocyclo, more preferably heterocyclo, still more preferably furyl, thienyl or pyridyl; and X. is preferably benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl. In one alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl;
R2 is benzoyl, R. is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R. is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo;
X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl;
R2 is benzoyl, R. is hydroxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X. is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R. is hydroxy and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R. is acyloxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X. is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R. is acyloxy and R14 is hydrido. In each of the alternatives of this embodiment when the taxane has structure 1, R, and R,o may each have the beta stereochemical configuration, R, and R,o may each have the alpha stereochemical configuration, R, may have the alpha stereochemical configuration while R,o has the beta stereochemical configuration or R, may have the beta stereochemical configuration while R,o has the alpha stereochemical configuration.
Also among the preferred embodiments are taxanes corresponding to structure 1 or 2 wherein R7 is R,aC00- wherein R7a is propyl. In this embodiment, X3 is preferably cycloalkyl, isobutenyl, phenyl, substituted phenyl such as p-nitrophenyl, or heterocyclo, more preferably heterocyclo, still more preferably furyl, thienyl or pyridyl; and X5 is preferably benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl. In one alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl;
R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X. is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo;
X. is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl;
R2 is benzoyl, R. is hydroxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R. is hydroxy and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X. is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydrido. In each of the alternatives of this embodiment when the taxane has structure 1, R, and R,o may each have the beta stereochemical configuration, R, and R,o may each have the alpha stereochemical configuration, R7 may have the alpha stereochemical configuration while R,o has the beta stereochemical configuration or R, may have the beta stereochemical configuration while R,o has the alpha stereochemical configuration.
Taxanes having the general formula 1 may be obtained by treatment of a P-lactam with an alkoxide having the taxane tetracyclic nucleus and a C-13 metallic oxide substituent to form compounds having aP-amido ester substituent at C-13 (as described more fully in Holton U.S. Patent 5,466,834), followed by removal of the hydroxy protecting groups. The R-lactam has the following structural formula (3):

N

\,. .,"0 P2 (3) wherein P2 is a hydroxy protecting group and X3 and X5 are as previously defined and the alkoxide has the structural formula (4):

R

- t MO'', R2 O OAc (4) wherein M is a metal or ammonium, P,o is a hydroxy protecting group and R2, R9, R, and R14 are as previously defined.
Alkoxide 4 may be prepared from 10-deacetylbaccatin I I I (or a derivative thereof) by selective protection of the C-10 hydroxyl group and then esterification of the C-7 hydroxyl group followed by treatment with a metallic amide. In one embodiment of the present invention, the C(10) hydroxyl group of 10-deacetylbaccatin III is selectively protected with a silyl group using, for example, a silylamide or bissilyamide as a silylating agent. Preferred silylating agents include tri(hydrocarbyl)silyl-trifluoromethylacetamides and bis tri(hydrocarbyl)-silyltrifluoromethylacetamides (with the hydrocarbyl moiety being substituted or unsubstituted alkyl or aryl) such as N,O-bis-(trimethylsilyl) trifluoroacetamide, N,O-bis-(triethylsilyl)trifluoroacetamide, N-methyl-N-triethylsilyltrifluoroacetamide, and N,O-bis(t-butyldimethylsilyl)trifluoroacetamide. The silylating agents may be used either alone or in combination with a catalytic amount of a base such as an alkali metal base. Alkali metal amides, such as lithium amide catalysts, in general, and lithium hexamethyldisilazide, in particular, are preferred. The solvent for the selective silylation reaction is preferably an ethereal solvent such as tetrahydrofuran. Alternatively, however, other solvents such as ether or dimethoxyethane may be used. The temperature at which the C(10) selective silylation is carried out is not narrowly critical. In general, however, it is carried out at 0 C or greater.
Selective esterification of the C(7) hydroxyl group of a C(10) protected taxane can be achieved using any of a variety of common acylating agents including, but not limited to, substituted and unsubstituted carboxylic acid derivatives, e.g., carboxylic acid halides, anhydrides, dicarbonates, isocyanates and haloformates. For example, the C(7) hydroxyl group of the 1 0-protected-1 deacteyl baccatin III can be selectively acylated with dibenzyl dicarbonate, diallyl dicarbonate, 2,2,2-trichloroethyl chloroformate, benzyl chloroformate or another common acylating agent. In general, acylation of the C(7) hydroxy group of a C(10) protected taxane are more efficient and more selective than are C(7) acylations of a 7,10-dihydroxy taxane such as 10-DAB; stated another way, once the C(10) hydroxyl group has been protected, there is a significant difference in the reactivity of the remaining C(7), C(13), and C(1) hydroxyl groups. These acylation reactions may optionally be carried out in the presence or absence of an amine base.
Derivatives of 10-deacetylbaccatin III having alternative substituents at C(2), C(9) and C(14) and processes for their preparation are known in the art.
Taxane derivatives having acyloxy substituents other than benzoyloxy at C(2) may be prepared, for example, as described in Holton et al., U.S. Patent No.
5,728,725 or Kingston et al., U.S. Patent No. 6,002,023. Taxanes having acyloxy or hydroxy substituents at C(9) in place of keto may be prepared, for example as described in Holton et al., U.S. Patent No. 6,011,056 or Gunawardana et al., U.S.
Patent No. 5,352,806. Taxanes having a beta hydroxy substituent at C(14) may be prepared from naturally occurring 14-hydroxy-1 0-deacetylbaccatin Ill.
Processes for the preparation and resolution of the (3-lactam starting 5 material are generally well known. For example, the R-lactam may be prepared as described in Holton, U.S. Patent No. 5,430,160 and the resulting enatiomeric mixtures of (3-lactams may be resolved by a stereoselective hydrolysis using a lipase or enzyme as described, for example, in Patel, U.S. Patent No.
5,879,929 Patel U.S. Patent No. 5,567,614 or a liver homogenate as described, for example, 10 in PCT Patent Application No. 00/41204. In a preferred embodiment in which the P-lactam is furyl substituted at the C(4) position, the P-lactam can be prepared as illustrated in the following reaction scheme:

NH2 Step A

O + I toluene / \ ~ N ~ ., AcO~CI
o\CHO O ~ ~ OCH3 O

Step B H3CO Step C H3CG Step D
toluene \ N O Beef Liver N O CAN, CH3CN

L~ ~
NEt3 OAc Resolution _ "'OAc ~O O
(+) 9 (+) 9 Step E Step F

p-TsOH HN
HNO KOH HNO O

Me ~OOMe O
CO OAc CO ~ C'O
(-) 10 (+) 11 (-) 12 wherein Ac is acetyl, NEt3 is triethylamine, CAN is ceric ammonium nitrate, and p-TsOH is p-toluenesulfonic acid. The beef liver resolution may be carried out, for example, by combining the enatiomeric R-lactam mixture with a beef liver suspension (prepared, for example, by adding 20 g of frozen beef liver to a blender and then adding a pH 8 buffer to make a total volume of 1 L).
Compounds of formula 1 of the instant invention are useful for inhibiting tumor growth in mammals including humans and are preferably administered in the form of a pharmaceutical composition comprising an effective antitumor amount of a compound of the instant invention in combination with at least one pharmaceutically or pharmacologically acceptable carrier. The carrier, also known in the art as an excipient, vehicle, auxiliary, adjuvant, or diluent, is any substance which is pharmaceutically inert, confers a suitable consistency or form to the composition, and does not diminish the therapeutic efficacy of the antitumor compounds. The carrier is "pharmaceutically or pharmacologically acceptable"
if it does not produce an adverse, allergic or other untoward reaction when administered to a mammal or human, as appropriate.
The pharmaceutical compositions containing the antitumor compounds of the present invention may be formulated in any conventional manner. Proper formulation is dependent upon the route of administration chosen. The compositions of the invention can be formulated for any route of administration so long as the target tissue is available via that route. Suitable routes of administration include, but are not limited to, oral, parenteral (e.g., intravenous, intraarterial, subcutaneous, rectal, subcutaneous, intramuscular, intraorbital, intracapsular, intraspinal, intraperitoneal, or intrasternal), topical (nasal, transdermal, intraocular), intravesical, intrathecal, enteral, pulmonary, intralymphatic, intracavital, vaginal, transurethral, intradermal, aural, intramammary, buccal, orthotopic, intratracheal, intralesional, percutaneous, endoscopical, transmucosal, sublingual and intestinal administration.
Pharmaceutically acceptable carriers for use in the compositions of the present invention are well known to those of ordinary skill in the art and are selected based upon a number of factors: the particular antitumor compound used, and its concentration, stability and intended bioavailability; the disease, disorder or condition being treated with the composition; the subject, its age, size and general condition; and the route of administration. Suitable carriers are readily determined by one of ordinary skill in the art (see, for example, J.
G. Nairn, in: Remington's Pharmaceutical Science (A. Gennaro, ed.), Mack Publishing Co., = CA 02368993 2008-11-13 Easton, Pa., (1985), pp. 1492-1517).

The compositions are preferably formulated as tablets, dispersible powders, pills, capsules, gelcaps,.caplets, gels, liposomes, granules, solutions, suspensions, emulsions, syrups, elixirs, troches, dragees, lozenges, or any other dosage form which can be administered orally. Techniques and compositions for making oral dosage forms useful in the present invention are described in the following references: 7 Modern Pharmaceutics, Chapters 9 and 10 (Banker &
Rhodes, Editors, 1979); Lieberman et al., Pharmaceutical Dosage Forms: Tablets (1981); and Ansel, Introduction to Pharmaceutical Dosage Forms 2nd Edition (1976).
The compositions of the invention for oral administration comprise an effective antitumor amount of a compound of the invention in a pharmaceutically acceptable carrier. Suitable carriers for solid dosage forms include sugars, starches, and other conventional substances including lactose, talc, sucrose, gelatin, carboxymethylcellulose, agar, mannitol, sorbitol, calcium phosphate, calcium carbonate, sodium carbonate, kaolin, alginic acid, acacia, corn starch, potato starch, sodium saccharin, magnesium carbonate, tragacanth, microcrystalline cellulose, colloidal silicon dioxide, croscarmellose sodium, talc, magnesium stearate, and stearic acid. Further, such solid dosage forms may be uncoated or may be coated by known techniques; e.g., to delay disintegration and absorption.
The antitumor compounds of the present invention are also preferably formulated for parenteral administration, e.g., formulated for injection via intravenous, intraarterial, subcutaneous, rectal, subcutaneous, intramuscular, intraorbital, intracapsular, intraspinal, intraperitoneal, or intrasternal routes. The compositions of the invention for parenteral administration comprise an effective antitumor amount of the antitumor compound in a pharmaceutically acceptable carrier. Dosage forms suitable for parenteral administration include solutions, suspensions, dispersions, emulsions or any other dosage form which can be administered parenterally. Techniques and compositions for making parenteral dosage forms are known in the art.
Suitable carriers used in formulating liquid dosage forms for oral or parenteral administration include nonaqueous, pharmaceutically-acceptable polar solvents such as oils, alcohols, amides, esters, ethers, ketones, hydrocarbons and mixtures thereof, as well as water, saline solutions, dextrose solutions (e.g_, DW5), electrolyte solutions, or any other aqueous, pharmaceutically acceptable liquid.
Suitable nonaqueous, pharmaceutically-acceptable polar solvents include, but are not limited to, alcohols (e.g., a-glycerol formal, P-glycerol formal, 1, 3-butyleneglycol, aliphatic or aromatic alcohols having 2-30 carbon atoms such as methanol, ethanol, propanol, isopropanol, butanol, t-butanol, hexanol, octanol, amylene hydrate, benzyl alcohol, glycerin (glycerol), glycol, hexylene glycol, tetrahydrofurfuryl alcohol, lauryl alcohol, cetyl alcohol, or stearyl alcohol, fatty acid esters of fatty alcohols such as polyalkylene glycols (e.g., polypropylene glycol, polyethylene glycol), sorbitan, sucrose and cholesterol); amides (e.g., dimethylacetamide (DMA), benzyl benzoate DMA, dimethylformamide, N-(P-hydroxyethyl)-lactamide, N, N-dimethylacetamide amides, 2-pyrrolidinone, 1-methyl-2-pyrrolidinone, or polyvinylpyrrolidone); esters (e.g., 1 -methyl-2-pyrrolidinone, 2-pyrrolidinone, acetate esters such as monoacetin, diacetin, and triacetin, aliphatic or aromatic esters such as ethyl caprylate or octanoate, alkyl oleate, benzyl benzoate, benzyl acetate, dimethylsulfoxide (DMSO), esters of glycerin such as mono, di, or tri-glyceryl citrates or tartrates, ethyl benzoate, ethyl acetate, ethyl carbonate, ethyl lactate, ethyl oleate, fatty acid esters of sorbitan, fatty acid derived PEG esters, glyceryl monostearate, glyceride esters such as mono, di, or tri-glycerides, fatty acid esters such as isopropyl myristrate, fatty acid derived PEG esters such as PEG-hydroxyoleate and PEG-hydroxystearate, N-methyl pyrrolidinone, pluronic 60, polyoxyethylene sorbitol oleic polyesters such as poly(ethoxylated)3o-6o sorbitol poly(oleate)2-4, poly(oxyethylene)15-20 monooleate, poly(oxyethylene)15_20mono 1 2-hyd roxystea rate, and poly(oxyethylene)15_20 mono ricinoleate, polyoxyethylene sorbitan esters such as polyoxyethylene-sorbitan monooleate, polyoxyethylene-sorbitan monopalmitate, polyoxyethylene-sorbitan monolaurate, polyoxyethylene-sorbitan monostearate, and Polysorbate 20, 40, 60 or 80 from ICI Americas, Wilmington, DE, polyvinylpyrrolidone, alkyleneoxy modified fatty acid esters such as polyoxyl 40 hydrogenated castor oil and polyoxyethylated castor oils (e.g., Cremophor EL solution or Cremophor RH
solution), saccharide fatty acid esters (i.e., the condensation product of a monosaccharide (e.g., pentoses such as ribose, ribulose, arabinose, xylose, lyxose and xylulose, hexoses such as glucose, fructose, galactose, mannose and sorbose, trioses, tetroses, heptoses, and octoses), disaccharide (e.g., sucrose, 35 maltose, lactose and trehalose) or oligosaccharide or mixture thereof with a C4 C22 fatty acid(s)(e.g., saturated fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, paimitic acid and stearic acid, and unsaturated fatty acids such as palmitoleic acid, oleic acid, elaidic acid, erucic acid and linoleic acid)), or steroidal esters); alkyl, aryl, or cyclic ethers having 2-30 carbon atoms (e.g., diethyl ether, tetrahydrofuran, dimethyl isosorbide, diethylene glycol monoethyl ether); glycofurol (tetrahydrofurfuryl alcohol polyethylene glycol ether);
ketones having 3-30 carbon atoms (e.g., acetone, methyl ethyl ketone, methyl isobutyl ketone); aliphatic, cycloaliphatic or aromatic hydrocarbons having 4-30 carbon atoms (e.g., benzene, cyclohexane, dichloromethane, dioxolanes, hexane, n-decane, n-dodecane, n-hexane, sulfolane, tetramethylenesulfon, tetramethylenesulfoxide, toluene, dimethylsulfoxide (DMSO), or tetramethylenesulfoxide); oils of mineral, vegetable, animal, essential or synthetic origin (e.g., mineral oils such as aliphatic or wax-based hydrocarbons, aromatic hydrocarbons, mixed aliphatic and aromatic based hydrocarbons, and refined paraffin oil, vegetable oils such as linseed, tung, safflower, soybean, castor, cottonseed, groundnut, rapeseed, coconut, palm, olive, corn, corn germ, sesame, persic and peanut oil and glycerides such as mono-, di- or triglycerides, animal oils such as fish, marine, sperm, cod-liver, haliver, squalene, squalane, and shark liver oil, oleic oils, and polyoxyethylated castor oil); alkyl or aryl halides having 1-30 carbon atoms and optionally more than one halogen substituent; methylene chloride; monoethanolamine; petroleum benzin; trolamine; omega-3 polyunsaturated fatty acids (e.g., alpha-linolenic acid, eicosapentaenoic acid, docosapentaenoic acid, or docosahexaenoic acid); polyglycol ester of 12-hydroxystearic acid and polyethylene glycol (Solutol HS-15, from BASF, Ludwigshafen, Germany); polyoxyethylene glycerol; sodium laurate; sodium oleate; or sorbitan monooleate.
Other pharmaceutically acceptable solvents for use in the invention are well known to those of ordinary skill in the art, and are identified in The Chemotherapy Source Book (Williams & Wilkens Publishing), The Handbook of Pharmaceutical Excipients, (American Pharmaceutical Association, Washington, D.C., and The Pharmaceutical Society of Great Britain, London, England, 1968), Modern Pharmaceutics, (G. Banker et al., eds., 3d ed.)(Marcel Dekker, Inc., New York, New York, 1995), The Pharmacoloaical Basis of Therapeutics, (Goodman &
Gilman, McGraw Hill Publishing), Pharmaceutical Dosage Forms, (H. Lieberman et al., eds., )(Marcel Dekker, Inc., New York, New York, 1980), Remington's Pharmaceutical Sciences (A. Gennaro, ed., 19th ed.)(Mack Publishing, Easton, PA, 1995), The United States Pharmacopeia 24, The National Formulary 19, WO 01/57027 PCT/USOl/03385 (National Publishing, Philadelphia, PA, 2000), A.J. Spiegel et al., and Use of Nonaqueous Solvents in Parenteral Products, JOURNAL OF PHARMACEUTICAL
SCIENCES, Vol. 52, No. 10, pp. 917-927 (1963).
Preferred solvents include those known to stabilize the antitumor 5 compounds, such as oils rich in triglycerides, for example, safflower oil, soybean oil or mixtures thereof, and alkyleneoxy modified fatty acid esters such as polyoxyl 40 hydrogenated castor oil and polyoxyethylated castor oils (e.g., Cremophor EL solution or Cremophor RH 40 solution). Commercially available triglycerides include Intralipid emulsified soybean oil (Kabi-Pharmacia 10 Inc., Stockholm, Sweden), Nutralipid emulsion (McGaw, Irvine, California), Liposyn 1120% emulsion (a 20% fat emulsion solution containing 100 mg safflower oil, 100 mg soybean oil, 12 mg egg phosphatides, and 25 mg glycerin per ml of solution; Abbott Laboratories, Chicago, Illinois), Liposyn 1112%
emulsion (a 2% fat emulsion solution containing 100 mg safflower oil, 100 mg 15 soybean oil, 12 mg egg phosphatides, and 25 mg glycerin per ml of solution;
Abbott Laboratories, Chicago, Illinois), natural or synthetic glycerol derivatives containing the docosahexaenoyl group at levels between 25% and 100% by weight based on the total fatty acid content (Dhasco (from Martek Biosciences Corp., Columbia, MD), DHA Maguro (from Daito Enterprises, Los Angeles, CA), Soyacal , and Travemulsion . Ethanol is a preferred solvent for use in dissolving the antitumor compound to form solutions, emulsions, and the like.
Additional minor components can be included in the compositions of the invention for a variety of purposes well known in the pharmaceutical industry.
These components will for the most part impart properties which enhance retention of the antitumor compound at the site of administration, protect the stability of the composition, control the pH, facilitate processing of the antitumor compound into pharmaceutical formulations, and the like. Preferably, each of these components is individually present in less than about 15 weight % of the total composition, more preferably less than about 5 weight %, and most preferably less than about 0.5 weight % of the total composition. Some components, such as fillers or diluents, can constitute up to 90 wt.% of the total composition, as is well known in the formulation art. Such additives include cryoprotective agents for preventing reprecipitation of the taxane, surface active, wetting or emulsifying agents (e.g., lecithin, polysorbate-80, Tween 80, pluronic 60, polyoxyethylene stearate ), preservatives (e.g., ethyl-p-hydroxybenzoate), microbial preservatives (e.g., benzyl alcohol, phenol, m-cresol, chlorobutanol, sorbic acid, thimerosal and paraben), agents for adjusting pH or buffering agents (e.g., acids, bases, sodium acetate, sorbitan monolaurate), agents for adjusting osmolarity (e.g., glycerin), thickeners (e.g., aluminum monostearate, stearic acid, cetyl alcohol, stearyl alcohol, guar gum, methyl cellulose, hydroxypropylcellulose, tristearin, cetyl wax esters, polyethylene glycol), colorants, dyes, flow aids, non-volatile silicones (e.g., cyclomethicone), clays (e.g., bentonites), adhesives, bulking agents, flavorings, sweeteners, adsorbents, fillers (e.g., sugars such as lactose, sucrose, mannitol, or sorbitol, cellulose, or calcium phosphate), diluents (e.g., water, saline, electrolyte solutions), binders (e.g., starches such as maize starch, wheat starch, rice starch, or potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropyl methylcellulose, sodium carboxymethyl cellulose, polyvinylpyrrolidone, sugars, polymers, acacia), disintegrating agents (e.g., starches such as maize starch, wheat starch, rice starch, potato starch, or carboxymethyl starch, cross-linked polyvinyl pyrrolidone, agar, alginic acid or a salt thereof such as sodium alginate, croscarmellose sodium or crospovidone), lubricants (e.g., silica, talc, stearic acid or salts thereof such as magnesium stearate, or polyethylene glycol), coating agents (e.g., concentrated sugar solutions including gum arabic, talc, polyvinyl pyrrolidone, carbopol gel, polyethylene glycol, or titanium dioxide), and antioxidants (e.g., sodium metabisulfite, sodium bisulfite, sodium sulfite, dextrose, phenols, and thiophenols).
In a preferred embodiment, a pharmaceutical composition of the invention comprises at least one nonaqueous, pharmaceutically acceptable solvent and an antitumor compound having a solubility in ethanol of at least about 100, 200, 300, 400, 500, 600, 700 or 800 mg/mI. While not being bound to a particular theory, it is believed that the ethanol solubility of the antitumor compound may be directly related to its efficacy. The antitumor compound can also be capable of being crystallized from a solution. In other words, a crystalline antitumor compound, such as compound 1393, can be dissolved in a solvent to form a solution and then recrystallized upon evaporation of the solvent without the formation of any amorphous antitumor compound. It is also preferred that the antitumor compound have an ID50 value (i.e, the drug concentration producing 50% inhibition of colony formation) of at least 4, 5, 6, 7, 8, 9, or 10 times less that of paclitaxel when measured according to the protocol set forth in the working examples.
Dosage form administration by these routes may be continuous or intermittent, depending, for example, upon the patient's physiological condition, whether the purpose of the administration is therapeutic or prophylactic, and other factors known to and assessable by a skilled practitioner.
Dosage and regimens for the administration of the pharmaceutical compositions of the invention can be readily determined by those with ordinary skill in treating cancer. It is understood that the dosage of the antitumor compounds will be dependent upon the age, sex, health, and weight of the recipient, kind of concurrent treatment, if any, frequency of treatment, and the nature of the effect desired. For any mode of administration, the actual amount of antitumor compound delivered, as well as the dosing schedule necessary to achieve the advantageous effects described herein, will also depend, in part, on such factors as the bioavailability of the antitumor compound, the disorder being treated, the desired therapeutic dose, and other factors that will be apparent to those of skill in the art. The dose administered to an animal, particularly a human, in the context of the present invention should be sufficient to effect the desired therapeutic response in the animal over a reasonable period of time.
Preferably, an effective amount of the antitumor compound, whether administered orally or by another route, is any amount which would result in a desired therapeutic response when administered by that route. Preferably, the compositions for oral administration are prepared in such a way that a single dose in one or more oral preparations contains at least 20 mg of the antitumor compound per m2 of patient body surface area, or at least 50, 100, 150, 200, 300, 400, or 500 mg of the antitumor compound per m2 of patient body surface area, wherein the average body surface area for a human is 1.8 m2. Preferably, a single dose of a composition for oral administration contains from about 20 to about 600 mg of the antitumor compound per m2 of patient body surface area, more preferably from about 25 to about 400 mg/m2, even more preferably, from about 40 to about 300 mg/m2, and even more preferably from about 50 to about 200 mg/m2. Preferably, the compositions for parenteral administration are prepared in such a way that a single dose contains at least 20 mg of the antitumor compound per m2 of patient body surface area, or at least 40, 50, 100, 150, 200, 300, 400, or 500 mg of the antitumor compound per m2 of patient body surface area. Preferably, a single dose in one or more parenteral preparations contains from about 20 to about mg of the antitumor compound per m2 of patient body surface area, more preferably from about 40 to about 400 mg/mz, and even more preferably, from about 60 to about 350 mg/m2. However, the dosage may vary depending on the dosing schedule which can be adjusted as necessary to achieve the desired therapeutic effect. It should be noted that the ranges of effective doses provided herein are not intended to limit the invention and represent preferred dose ranges. The most preferred dosage will be tailored to the individual subject, as is understood and determinable by one of ordinary skill in the art without undue experimentation.
The concentration of the antitumor compound in a liquid pharmaceutical composition is preferably between about 0.01 mg and about 10 mg per ml of the composition, more preferably between about 0.1 mg and about 7 mg per mi, even more preferably between about 0.5 mg and about 5 mg per ml, and most preferably between about 1.5 mg and about 4 mg per ml. Relatively low concentrations are generally preferred because the antitumor compound is most soluble in the solution at low concentrations. The concentration of the antitumor compound in a solid pharmaceutical composition for oral administration is preferably between about 5 weight % and about 50 weight %, based on the total weight of the composition, more preferably between about 8 weight % and about 40 weight %, and most preferably between about 10 weight % and about 30 weight %.
In one embodiment, solutions for oral administration are prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution. An appropriate volume of a carrier which is a solution, such as Cremophor EL solution, is added to the solution while stirring to form a pharmaceutically acceptable solution for oral administration to a patient. If desired, such solutions can be formulated to contain a minimal amount of, or to be free of, ethanol, which is known in the art to cause adverse physiological effects when administered at certain concentrations in oral formulations.
In another embodiment, powders or tablets for oral administration are prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g.,ethanol or methylene chloride) to form a solution. The solvent can optionally be capable of evaporating when the solution is dried under vacuum. An additional carrier can be added to the solution prior to drying, such as Cremophor EL solution. The resulting solution is dried under vacuum to form a glass. The glass is then mixed with a binder to form a powder. The powder can be mixed with fillers or other conventional tabletting agents and processed to form a tablet for oral administration to a patient. The powder can also be added to any liquid carrier as described above to form a solution, emulsion, suspension or the like for oral administration.
Emulsions for parenteral administration can be prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution.
An appropriate volume of a carrier which is an emulsion, such as Liposyn II
or Liposyn III emulsion, is added to the solution while stirring to form a pharmaceutically acceptable emulsion for parenteral administration to a patient. If desired, such emulsions can be formulated to contain a minimal amount of, or to be free of, ethanol or Cremophor solution, which are known in the art to cause adverse physiological effects when administered at certain concentrations in parenteral formulations.
Solutions for parenteral administration can be prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution.
An appropriate volume of a carrier which is a solution, such as Cremophor0 solution, is added to the solution while stirring to form a pharmaceutically acceptable solution for parenteral administration to a patient. If desired, such solutions can be formulated to contain a minimal amount of, or to be free of, ethanol or Cremophor solution, which are known in the art to cause adverse physiological effects when administered at certain concentrations in parenteral formulations.
If desired, the emulsions or solutions described above for oral or parenteral administration can be packaged in IV bags, vials or other conventional containers in concentrated form and diluted with any pharmaceutically acceptable liquid, such as saline, to form an acceptable taxane concentration prior to use as is known in the art.

, = CA 02368993 2008-11-13 19a The invention also provides uses of the taxanes or compositions of the invention for: (i) preparing a medicament for the inhibition of tumor growth in a mammal, or (ii) the inhibition of tumor growth in a mammal.

The invention also provides a commercial package comprising a taxane or composition of the invention and associated therewith instructions for the use thereof in the inhibition of tumor growth in a mammal.

Definitions The terms "hydrocarbon" and "hydrocarbyl" as used herein to describe organic compounds or radicals consisting exclusively of the elements carbon and hydrogen. These moieties include alkyl, alkenyl, alkynyl, and aryl moieties.
These moieties also include alkyl, alkenyl, alkynyl, and aryl moieties substituted with other aliphatic or cyclic hydrocarbon groups, such as alkaryl, alkenaryl and alkynaryl. Unless otherwise indicated, these moieties preferably comprise 1 to 20 carbon atoms.

The "substituted hydrocarbyl" moieties described herein are hydrocarbyl moieties which are substituted with at least one atom other than carbon, including moieties in which a carbon chain atom is substituted with a hetero atom such as nitrogen, oxygen, silicon, phosphorous, boron, sulfur, or a halogen atom.
These 5 substituents include halogen, heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyl, acyloxy, nitro, amino, amido, nitro, cyano, thiol, ketals, acetals, esters and ethers.
The term "heteroatom" shall mean atoms other than carbon and hydrogen.
The "heterosubstituted methyl" moieties described herein are methyl 10 groups in which the carbon atom is covalently bonded to at least one heteroatom and optionally with hydrogen, the heteroatom being, for example, a nitrogen, oxygen, silicon, phosphorous, boron, sulfur, or halogen atom. The heteroatom may, in turn, be substituted with other atoms to form a heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, oxy, acyloxy, nitro, 15 amino, amido, thiol, ketals, acetals, esters or ether moiety.
The "heterosubstituted acetate" moieties described herein are acetate groups in which the carbon of the methyl group is covalently bonded to at least one heteroatom and optionally with hydrogen, the heteroatom being, for example, a nitrogen, oxygen, silicon, phosphorous, boron, sulfur, or halogen atom. The 20 heteroatom may, in turn, be substituted with other atoms to form a heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, oxy, acyloxy, nitro, amino, amido, thiol, ketals, acetals, esters or ether moiety.
Unless otherwise indicated, the alkyl groups described herein are preferably lower alkyl containing from one to eight carbon atoms in the principal chain and up to 20 carbon atoms. They may be straight or branched chain or cyclic and include methyl, ethyl, propyl, isopropyl, butyl, hexyl and the like.
Unless otherwise indicated, the alkenyl groups described herein are preferably lower alkenyl containing from two to eight carbon atoms in the principal chain and up to 20 carbon atoms. They may be straight or branched chain or cyclic and include ethenyl, propenyl, isopropenyl, butenyl, isobutenyl, hexenyl, and the like.
Unless otherwise indicated, the alkynyl groups described herein are preferably lower alkynyl containing from two to eight carbon atoms in the principal chain and up to 20 carbon atoms. They may be straight or branched chain and include ethynyl, propynyl, butynyl, isobutynyl, hexynyl, and the like.

The terms "aryl" or "ar" as used herein alone or as part of another group denote optionally substituted homocyclic aromatic groups, preferably monocyclic or bicyclic groups containing from 6 to 12 carbons in the ring portion, such as phenyl, biphenyl, naphthyl, substituted phenyl, substituted biphenyl or substituted naphthyl. Phenyl and substituted phenyl are the more preferred aryl.
The terms "halogen" or "halo" as used herein alone or as part of another group refer to chlorine, bromine, fluorine, and iodine.
The terms "heterocyclo" or "heterocyclic" as used herein alone or as part of another group denote optionally substituted, fully saturated or unsaturated, monocyclic or bicyclic, aromatic or nonaromatic groups having at least one heteroatom in at least one ring, and preferably 5 or 6 atoms in each ring. The heterocyclo group preferably has 1 or 2 oxygen atoms, 1 or 2 sulfur atoms, and/or 1 to 4 nitrogen atoms in the ring, and may be bonded to the remainder of the molecule through a carbon or heteroatom. Exemplary heterocyclo include heteroaromatics such as furyl, thienyl, pyridyl, oxazolyl, pyrrolyl, indolyl, quinolinyl, or isoquinolinyl and the like. Exemplary substituents include one or more of the following groups: hydrocarbyl, substituted hydrocarbyl, keto, hydroxy, protected hydroxy, acyl, acyloxy, alkoxy, alkenoxy, alkynoxy, aryloxy, halogen, amido, amino, nitro, cyano, thiol, ketals, acetals, esters and ethers.
The term "heteroaromatic" as used herein alone or as part of another group denote optionally substituted aromatic groups having at least one heteroatom in at least one ring, and preferably 5 or 6 atoms in each ring. The heteroaromatic group preferably has 1 or 2 oxygen atoms, 1 or 2 sulfur atoms, and/or I to 4 nitrogen atoms in the ring, and may be bonded to the remainder of the molecule through a carbon or heteroatom. Exemplary heteroaromatics include furyl, thienyl, pyridyl, oxazolyl, pyrrolyl, indolyl, quinolinyl, or isoquinolinyl and the like. Exemplary substituents include one or more of the following groups:
hydrocarbyl, substituted hydrocarbyl, keto, hydroxy, protected hydroxy, acyl, acyloxy, alkoxy, alkenoxy, alkynoxy, aryloxy, halogen, amido, amino, nitro, cyano, thiol, ketals, acetals, esters and ethers.
The term "acyl," as used herein alone or as part of another group, denotes the moiety formed by removal of the hydroxyl group from the group --COOH of an organic carboxylic acid, e.g., RC(O)-, wherein R is R1, R10-, R'RzN-, or R'S-, R' is hydrocarbyl, heterosubstituted hydrocarbyl, or heterocyclo, and R 2 is hydrogen, hydrocarbyl or substituted hydrocarbyl.

The term "acyloxy," as used herein alone or as part of another group, denotes an acyl group as described above bonded through an oxygen linkage (--0--), e.g., RC(O)O- wherein R is as defined in connection with the term "acyl."
Unless otherwise indicated, the alkoxycarbonyloxy moieties described herein comprise lower hydrocarbon or substituted hydrocarbon or substituted hydrocarbon moieties.
Unless otherwise indicated, the carbamoyloxy moieties described herein are derivatives of carbamic acid in which one or both of the amine hydrogens is optionally replaced by a hydrocarbyl, substituted hydrocarbyl or heterocyclo moiety.
The terms "hydroxyl protecting group" and "hydroxy protecting group" as used herein denote a group capable of protecting a free hydroxyl group ("protected hydroxyl") which, subsequent to the reaction for which protection is employed, may be removed without disturbing the remainder of the molecule. A
variety of protecting groups for the hydroxyl group and the synthesis thereof may be found in "Protective Groups in Organic Synthesis" by T. W. Greene, John Wiley and Sons, 1981, or Fieser & Fieser. Exemplary hydroxyl protecting groups include methoxymethyl, 1-ethoxyethyl, benzyloxymethyl, (.beta.-trimethylsilylethoxy)methyl, tetra hyd ropyranyl, 2,2,2-trichloroethoxycarbonyl, t-butyl(diphenyl)silyl, trialkylsilyl, trichloromethoxycarbonyl and 2,2,2-trichloroethoxymethyl.
As used herein, "Ac" means acetyl; "Bz" means benzoyl; "Et" means ethyl;
"Me" means methyl; "Ph" means phenyl; "Pr" means propyl; "Bu" means butyl;
"Am" means amyl; "cpro" means cyclopropyl; "iPr" means isopropyl; "tBu" and "t-Bu" means tert-butyl; "R" means lower alkyl unless otherwise defined; "Py"
means pyridine or pyridyl; "TES" means triethylsilyl; "TMS" means trimethylsilyl;
"LAH"
means lithium aluminum hydride; "10-DAB" means 10-desacetylbaccatin III";
"amine protecting group" includes, but is not limited to, carbamates, for example, 2,2,2-trichloroethylcarbamate or tertbutylcarbamate; "protected hydroxy" means -OP wherein P is a hydroxy protecting group; "PhCO" means phenylcarbonyl;
"tBuOCO" and "Boc" mean tert-butoxycarbonyl; "tAmOCO" means tert-amyloxycarbonyl; "2-FuCO" means 2-furylcarbonyl; "2-ThCO" means 2-thienylcarbonyl; "2-PyCO" means 2-pyridylcarbonyl; "3-PyCO" means 3-pyridylcarbonyl; "4-PyCO" means 4-pyridylcarbonyl; "C4H7CO" means butenylcarbonyl; "tC3H5CO" means trans-propenylcarbonyl; "EtOCO" means ethoxycarbonyl; "ibueCO" means isobutenylcarbonyl; "iBuCO" means isobutylcarbonyl; "iBuOCO" means isobutoxycarbonyl; "iPrOCO" means isopropyloxycarbonyl; "nPrOCO" means n-propyloxycarbonyl; "nPrCO" means n-propylcarbonyl; "ibue" means isobutenyl; "THF" means tetrahydrofuran; "DMAP"
means 4-dimethylamino pyridine; "LHMDS" means Lithium HexamethylDiSilazanide.

The following examples illustrate the invention.
Example 1 HO O OTES TESO
O
H F3C-~ NTES H
HOI" > HO..,.
LHMDS
H ' HO =
BzOAcO O BzOACO O

10-Triethylsilyl-10-deacetyl baccatin III. To a solution of 1.0 g (1.84 mmol) of 10-deacetyl baccatin I I I in 50 mL of THF at -10 C under a nitrogen atmosphere was added 0.857 mL (2.76 mmol, 1.5 mol equiv) of N,O-(bis)-TES-trifluoroacetamide over a period of 3 min. This was followed by the addition of 0.062 mL of a 0.89 M THF solution of lithium bis(trimethylsilyl)amide (0.055 mmol, 0.03 mol equiv). After 10 min 0.038 mL (0.92 mmol, 0.5 mol equiv) of methanol was added, and after an additional 5 min 4 mL (0.055 mmol, 0.03 mol equiv) of acetic acid was added. The solution was diluted with 300 mL of ethyl acetate and washed two times with 100 mL of saturated aqueous sodium bicarbonate solution. The combined aqueous layers were extracted with 100 mL of ethyl acetate and the combined organic layers were washed with brine, dried over sodium sulfate, and concentrated under reduced pressure. To the residue was added 100 mL of hexane and the solid (1.23 g, 101 %) was collected by filtration.
Recrystallization of the solid by dissolving in boiling ethyl acetate (20 mL, mL/g) and cooling to room temperature gave 1.132 g (94%) of a white solid.
m.p.
242 C; [a]p25 -60.4 (c 0.7, CHCI3); 'H NMR (CDCI3, 400MHz) b(p.p.m): 8.10 (2H, d, Jm = 7.5Hz, Bzo), 7.60 (1 H, t, Jm = 7.5Hz, Bzp), 7.47 (2H, t, Jo = 7.5Hz, Bzm), 5.64 (1 H, d, J3 = 6.9Hz, H2), 5.26 (1 H, s, H10), 4.97 (1 H, dd, J60 =
2.2Hz, J6a = 9.9Hz, H5), 4.85 (1 H, dd, J14a = 8.9Hz, J14R = 8.9Hz, H13), 4.30 (1 H, d, J200= 8.5Hz, H20a), 4.23 (1 H, ddd, J7OH = 4.5Hz, J6a = 6.6Hz, J60= 11.0Hz, WO 01/57027 PCT[USOI/03385 H7), 4.15 (1 H, d, J20a = 8.5Hz, H200), 4.00 (1 H, d, J2 = 6.9Hz, H3), 2.58 (1 H, ddd, J7 = 6.6Hz, J5 = 9.9Hz, J60 = 14.5Hz, H6a), 2.28-2.25 (5H, m, 4Ac, H14a, H14[3 ), 2.02 (3H, s, 18Me), 1.97 (1 H, d, J7 = 4.5Hz, H7OH), 1.78 (1 H, ddd, J7 = 11.0Hz, J5 = 2.2Hz, J6a = 14.5Hz, H6[i), 1.68 (3H, s, 19Me), 1.56 (1 H, s, OH1), 1.32 (1 H, d, J13 = 8.8Hz, OH13 ), 1.18 (3H, s, 17Me), 1.06 (3H, s, 16Me), 0.98 (9H, t, JCH2(TES) = 7.3Hz, CH3(TES)), 0.65 (6H, dq, JCH3(TES) 7.3Hz, CH2(TES)).

TESO O TESO O

HO'.=~ HO'.=.
,,~ ==.
H - H
BzOAcO O BzOAcO O
10-Triethylsilyl-10-deacetyl-7-propionyl baccatin III. To a solution of 1.0 g (1.517 mmol) of 10-triethylsilyl-10-deacetyl baccatin III and 37.0 mg (0.303 mmol) of DMAP in 20 mL of dichloromethane at room temperature under a nitrogen atmosphere was added 0.920 mL (11.381 mmol) of pyridine and 0.329 mL (3.794 mmol, 2.5 mol equiv) of propionyl chloride in that order. The mixture was stirred at room temperature for 6 h, diluted with 350 mL of ethyl acetate and extracted with 50 mL of 10% aqueous copper sulfate solution. The organic layer was washed with 50 mL of saturated aqueous sodium bicarbonate solution, 50 mL of brine, dried over sodium sulfate and concentrated under reduced pressure. The crude product was dissolved in 75 mL of ethyl acetate, 100 mg of Norit A was added, the mixture was filtered through celite and concentrated under reduced pressure to give 1.13 g of material. Recrystallization from ethyl acetate/hexanes (dissolved in 6.5 mL of refluxing ethyl acetate, then 24 mL of hexanes added, allowed to cool to room temperature, and left to stand for 17 h) afforded 787 mg (72.5%) of a white crystalline solid. A second recrystallization (ca 340 mg material dissolved in 2 mL of refluxing ethyl acetate, then 10 mL of hexanes added, allowed to cool to room temperature, and allowed to stand for 17 h) afforded mg (16.7 %) of a white crystalline solid. The combined yield after recrystallization was 89.2%. m.p. 129 C; [a]p25 -47.9 (c 1.0, CHC13); NMR'H (CDC13, 300MHz) 6 (ppm): 8.10 (2H, d, Jm = 7.4Hz, Bzo), 7.60 (1 H, t, Jm = 7.4Hz, Bzp), 7.48 (2H, dd, Jo = 7.4Hz, Jp = 7.4Hz, Bzm), 5.64 (1 H, d, J3 = 7.4Hz, H2), 5.47 (1 H, dd, J6a = 7.4Hz, J60 = 10.1 Hz, H7), 5.28 (1 H, s, H10), 4.94 (1 H, d, J6a =
9.4Hz, H5), 4.80 - 4.90 (1 H, m, H13), 4.31 (1 H, d, J20[3 = 8.1 Hz, H20a), 4.16 (1 H, d, J20a = 8.1 Hz, H20(3), 4.06 (1 H, d, J2 = 7.4Hz, H3), 2.55 (1 H, ddd, J7 =
7.4Hz, J5 = 9.4Hz, J6R = 14.8Hz, H6a), 2.28 (3H, s, 4Ac), 2.23 - 2.32 (4H, m, 7CH2, H14a, H14[3), 2.07 (3H, s, 18Me), 2.02 (1 H, d, J13 = 4.7Hz, OH13), 1.76 - 1.87 (4H, m, 5 H6R, 19Me), 1.60 (1 H, s, OH1), 1.17 (3H, s, 17Me), 1.09 (3H, t, J 7CH2 =
7.4Hz, 7CH3), 1.04 (3H, s, 16Me), 0.96 (9H, t, JCH2(TES) = 8.0Hz, CH3(TES)), 0.52 -0.62 (6H, m, CH2(TES)).

Boc. 0 TESO N--~ Boc-,, TESO
NN O O
~ OMOP
HO1,.. O a,,, \ O OMOP

HO LHMDS HO
BzOAcO O BzOACO O
2'-O-MOP-3'-desphenyl-3'-(2-furyl)-10-triethylsilyl-7-propionyl taxotere. To a solution of 493 mg (0.690 mmol) of 10-triethylsilyl-10-deacetyl-7-propionyl 10 baccatin III in 4 mL of anhydrous THF under a nitrogen atmosphere at -45 C
was added 0.72 mL (0.72 mmol) of a 1 M solution of LiHMDS in THF. After 0.5 h a solution of 263 mg (0.814 mmol) of the b-Lactam (predried as described above) in 2 mL of anhydrous THF was added. The mixture was warmed to 0 C, and after 2 h 0.5 mL of saturated aqueous sodium bicarbonate solution was added.
15 The mixture was diluted with 50 ml of ethyl acetate and washed two times with 5 mL of brine. The organic phase was dried over sodium sulfate and concentrated under reduced pressure to give 742 mg (104%) of a slightly yellow solid. The solid was recrystallized by dissolving it in 12 mL of a 1:5 mixture of ethyl acetate and hexane at reflux and then cooling to room temperature to give 627 mg (88%) 20 of a white crystalline solid. Evaporation of the mother liquor gave 96 mg of material which was recrystallized as above from 2 mL of a 1:5 mixture of ethyl acetate and hexane to give an additional 46 mg (6%) of white crystalline solid.
The total yield from recrystallization was 94%. Evaporation of the mother liquor gave 46 mg of material which was purified by column chromatography on silica 25 gel to give an additional 20 mg (3%) of product. m.p. 207-209 C; [a]p25 -30.0 (c 5.0, methanol); 'H NMR (CDC13, 400MHz) d (ppm): 8.09-8.11 (m, 2H), 7.58-7.61 (m, 1 H), 7.47-7.51(m, 2H), 7.39 (d, J = 0.8 Hz, 1 H), 6.34 (dd, J = 3.2, 1.6 Hz, 1 H), 6.26 (d, J = 3.2 Hz), 6.14 (dd, J = 8.8, 8.8 Hz, 1 H), 5.71 (d, J = 6.8 Hz, 1 H), 5.47 (dd, J = 10.0, 7.2 Hz, 1 H), 5.30-5.36 (m, 2H), 5.28 (s, 1 H), 4.95 (d, J =
7.6 Hz, 1 H), 4.76 (s, 1 H), 4.33 (d, J= 8.0 Hz, 1 H), 4,19 (d, J = 8.4 Hz, 1 H), 4.03 (d, J = 6.8 Hz, 1 H), 2.83 (s, 3H), 2.55 (ddd, J = 17.2, 9.6, 7.6, 1 H), 2.50 (s, 3H), 2.20-2.40 (m, 2H), 2.28 (q, J= 7.6 Hz, 2H), 1.95 (s, 3H), 1.84 (ddd, J = 14.8, 10.8, 2 Hz), 1.80 (s, 3H), 1.67 (s, 1 H), 1.39 (s, 9H), 1.32 (s, 3H), 1.21 (s, 3H), 1.20 (s, 3H), 1.74 (s, 3H), 1.09 (t, J = 7.6 Hz, 3H), 0.93-0.99 (m, 9H), 0.50-0.65 (m, 6H).
Boc,, UH 0 TESO O O Bc~NN O HO 0 - ~ O
a,. O H F O1õ
0 OMOP ~~~' O OH
H ; H
BzOAcO O BzOAcO O
3'-Desphenyl-3'-(2-furyl)-7-propionyl taxotere. (1393) To a solution of 206 mg (0.199 mmol) of 2'-O-MOP-3'-desphenyl-3'-(2-furyl)-1 0-triethylsilyl-7-propionyl taxotere in 1.7 mL of pyridine and 5.4 mL of acetonitrile at 0 C was added 0.80 mL (2.0 mmol) of an aqueous solution containing 49% HF. The mixture was warmed to room temperature for 14 h and was then diluted with 20 mL of ethyl acetate and washed three times with 2 mL of saturated aqueous sodium bicarbonate and then with 8 mL of brine. The organic phase was dried over sodium sulfate and concentrated under reduced pressure to give 170 mg (100%) of a white solid. The crude product was crystallized with 2 mL of solvent (CH2CI2:hexane=1:1.7) to give 155 mg (90.5%) of white crystals. Concentration of the mother liquor under reduced pressure gave 15 mg of material which was recrystallized using 0.2 mL of a 1:1.7 mixture of methylene chloride and hexane to give an additional 11 mg (7.5%) of white crystals. The total yield from recrystallization was 98%. m.p. 150-152 C; [a]p25 -27.0 (c 5.0, methanol);
Anal.
Calcd for C44H55NO1600.5H20: C, 61.18; H, 6.48. Found: C, 61.40; H, 6.65. 'H
NMR (CDCI3, 500 MHz) d (ppm): 8.11 (d, J = 7.5 Hz, 2H), 7.61 (dd, J = 7.5, 7.5 Hz, 1 H), 7.50 (dd, J = 8.0, 7.5 Hz 2H), 7.41 (d, J = 1.0 Hz, 1 H), 6.38 (dd, J = 3.0, 2.0 Hz, 1 H), 6.33 (d, J = 3.5 Hz), 6.22 (dd, J = 9.5, 9.5 Hz, 1 H), 5.69 (d, J = 7.0 Hz, 1 H), 5.49 (dd, J = 11.0, 7.5 Hz, 1 H), 5.35 (d, J = 9.5 Hz, 1 H), 5.33 (d, J = 1.5 Hz, 1 H), 5.25 (d, J = 9.5 Hz, 1 H), 4.94 (d, J 8.5 Hz, 1 H), 4.71 (dd, J =
5.5, 2.0 Hz, 1 H), 4.33 (d, J= 8.5 Hz, 1 H), 4,21 (d, J 8.5 Hz, 1 H), 4.01 (d, J = 6.5 Hz, 1 H), 3.97 (d, J = 1.5 Hz, 1 H), 3.30 (d, J = 5.5 Hz, 1 H), 2.54 (ddd, J = 16.5, 9.5, 7.0, 1 H), 2.41 (s, 3H), 2.37 (dd, J = 15.0, 9.0 Hz, 1 H), 2.30 (dd, J = 17.5, 9.5 Hz, 1 H), 2.25 (q, J = 7.5 Hz, 2H), 1.96 (s, 3H), 1.93 (ddd, J = 14.5, 11.0, 2.5 Hz), 1.85 (s, 3H), 1.64 (s, 1 H), 1.36 (s, 9H), 1.23 (s, 3H), 1.10 (t, J = 7.5 Hz, 3H).

Example 2 The procedures described in Example 1 were repeated, but other suitably protected P-lactams were substituted for the Q-lactam of Example 1 to prepare the series of compounds having structural formula (13) and the combinations of substituents identified in the following table.

X3 tR 7 OH
HO
BzOAcO O
(13) Compound X5 X3 R7 1351 tBuOCO- ibue EtCOO-1364 tBuOCO- 2-pyridyl EtCOO-1372 tBuOCO- 3-pyridyl EtCOO-1386 tBuOCO- 4-pyridyl EtCOO-1393 tBuOCO- 2-furyl EtCOO-1401 tBuOCO- 3-furyl EtCOO-1418 tBuOCO- 2-thienyl EtCOO-1424 tBuOCO- 3-thienyl EtCOO-1434 tBuOCO- isopropyl EtCOO-1447 tBuOCO- cyclobutyl EtCOO-1458 tBuOCO- phenyl EtCOO-3069 2-FuCO- 2-thienyl EtCOO-3082 iPrOCO- 2-thienyl EtCOO-3171 nPrCO- 2-furyl EtCOO-3196 iBuOCO- 2-furyl EtCOO-3232 iBuOCO- 2-thienyl EtCOO-3327 nPrCO- 2-thienyl EtC00-3388 PhCO- 3-thienyl EtC00-3444 iPrOCO- 2-furyl EtC00-3479 2-ThCO- 2-thienyl EtCOO-3555 C4H7CO- 2-thienyl EtCOO-3560 tC3H5CO- 2-thienyl EtCOO-3611 EtOCO- 2-furyl EtC00-3629 2-FuCO- 2-furyl EtC00-3632 2-ThCO- 2-furyl EtCOO-3708 tC3H5CO- 2-furyl EtCOO-3713 C4H7CO- 2-furyl EtCOO-4017 PhCO- 2-furyl EtCOO-4044 EtOCO- 2-thienyl EtC00-4106 3-PyCO- 2-thienyl EtCOO-4135 iPrOCO- 2-thienyl PrCOO-4175 PhCO- 2-thienyl PrCOO-4219 2-FuCO- 2-thienyl PrCOO-4256 tBuOCO- 2-thienyl PrCOO-4283 ibueCO- 2-thienyl PrCOO-4290 ibuOCO- 2-thienyl PrCOO-4312 ibueCO- 2-thienyl EtCOO-4388 2-ThCO- 2-thienyl PrCOO-4394 tBuOCO- 3-furyl PrCOO-4406 tBuOCO- isobutenyl PrCOO-4446 tBuOCO- 3-thienyl PrCOO-4499 tBuOCO- 2-furyl PrCOO-4544 iBuOCO- 3-thienyl EtCOO-4600 iBuOCO- 3-thienyl PrCOO-4616 iBuOCO- 2-furyl PrCOO-4737 tC3H5CO- 2-furyl PrCOO-4757 tC3H5CO- 2-thienyl PrCOO-6171 ibueOCO- 2-furyl EtCOO-6131 ibueOCO- 2-furyl iBuCOO-5989 ibueOCO- 2-furyl iPrCOO-6141 ibueOCO- 2-furyl nBuCOO-6181 ibueOCO- 2-furyl nPrCOO-6040 iBuOCO- 2-furYl ibueCOO-6121 iBuOCO- 2-furyl iPrCOO-6424 tAmOCO- 2-furyl EtCOO-6212 tAmOCO- 2-furyl EtCOO-6282 tAmOCO- 2 furyl iBuCOO-6252 tAmOCO- 2-furyl iPrCOO-6343 tAmOCO- 2-furyl nBuCOO-6272 tAmOCO- 2-furyl nPrCOO-6202 tC3H5CO- 2-furyl iPrCOO-4454 2-ThCO- 2-thienyl nPrCOO-4414 PhCO- 2-thienyl nPrCOO-6333 tBuOCO- 2-thienyl iPrCOO-6686 tBuOCO- 2 thienyl tC3H5COO-6363 tBuOCO- 2-thiazo EtCOO-4787 iBuOCO- 3-furyl EtCOO-4828 iBuOCO- 3-furyl nPrCOO-4898 tC3H5CO- 3-furyl EtCOO-4939 tC3H5CO- 3-furyl nPrCOO-5020 tC3H5CO- 3-thienyl EtCOO-5030 tC3H5CO- 3-thienyl nPrCOO-5191 iBuOCO- cpro EtCOO-5202 iBuOCO- cpro nPrCOO-5070 tBuOCO- cpro EtCOO-5080 tBuOCO- cpro nPrCOO-5121 iBuOCO- ibue EtCOO-15131 iBuOCO- ibue nPrCOO-Example 3 Following the processes described in Example 1 and elsewhere herein, the following specific taxanes having structural formula 14 may be prepared, wherein 5 R7 is as previously defined, including wherein R7 is R7aC00- and R,a is (i) substituted or unsubstituted C2 to C8 alkyl (straight, branched or cyclic), such as ethyl, propyl, butyl, pentyl, or hexyl; (ii) substituted or unsubstituted C2 to C8 alkenyl (straight, branched or cyclic), such as ethenyl, propenyl, butenyl, pentenyl or hexenyl; (iii) substituted or unsubstituted C2 to Ca alkynyl (straight or branched) 10 such as ethynyl, propynyl, butynyl, pentynyl, or hexynyl; (iv) substituted or unsubstituted phenyl; or (v) substituted or unsubstituted heterocyclo such as furyl, thienyl, or pyridyl. The substituents may be hydrocarbyl or any of the heteroatom containing substituents selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, 15 amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.

X3~O, O H
HO
BzOAcO O
(14) tBuOCO- 2-furyl RaCOO-20 tBuOCO- 3-furyl RaCOO-tBuOCO- 2-thienyl RaCOO-tBuOCO- 3-thienyl RaCOO-tBuOCO- 2-pyridyl RaCOO-tBUOCO- 3-pyridyl RaCOO-25 tBuOCO- 4-pyridyl RaCOO-tBuOCO- isobutenyl RaCOO-tBuOCO- isopropyl RaCOO-tBuOCO- cyclopropyl RaCOO-tBuOCO- cyclobutyl RaCOO-tBuOCO- cyclopentyl RaCOO-tBuOCO- phenyl RaCOO-benzoyl 2-furyl RaCOO-benzoyl 3-furyl RaCOO-benzoyl 2-thienyl RaCOO-benzoyl 3-thienyl RaCOO-benzoyl 2-pyridyl RaCOO-benzoyl 3-pyridyl RaCOO-benzoyl 4-pyridyl RaCOO-benzoyl isobutenyl RaCOO-benzoyl isopropyl RaCOO-benzoyl cyclopropyl RaCOO-benzoyl cyclobutyl RaCOO-benzoyl cyclopentyl RaCOO-benzoyl phenyl RaCOO-2-FuCO- 2-furyl RaCOO-2-FuCO- 3-furyl RaCOO-2-FuCO- 2-thienyl RaCOO-2-FuCO- 3-thienyl RaCOO-2-FUCO- 2-pyridyl RaCOO-2-FUCO- 3-pyridyl RaCOO-2-FuCO- 4-pyridyl RaCOO-2-FuCO- isobutenyl RaCOO-2-FuCO- isopropyl RaCOO-2-FuCO- cyclopropyl RaCOO-2-FUCO- cyclobutyl RaCOO-2-FuCO- cyclopentyl RaCOO-2-FuCO- phenyl RaCOO-2-ThCO- 2-furyl RaCOO-2-ThCO- 3-furyl RaCOO-2-ThCO- 2-thienyl RaCOO-2-ThCO- 3-thienyl RaCOO-2-ThCO- 2-pyridyl RaCOO-2-ThCO- 3-pyridyl RaCOO-2-ThCO- 4-pyridyl RaCOO-2-ThCO- isobutenyl RaCOO-2-ThCO- isopropyl RaCOO-2-ThCO- cyclopropyl RaCOO-2-ThCO- cyclobutyl RaCOO-2-ThCO- cyclopentyl RaCOO-2-ThCO- phenyl RaCOO-2-PyCO- 2-furyl RaCOO-2-PyCO- 3-furyl RaCOO-2-PyCO- 2-thienyl RaCOO-2-PyCO- 3-thienyl RaCOO-2-PyCO- 2-pyridyl RaCOO-2-PyCO- 3-pyridyl RaCOO-2-PyCO- 4-pyridyl RaC00-2-PyCO- isobutenyl RaCOO-2-PyCO- isopropyl RaCOO-2-PyCO- cyclopropyl RaCOO-2-PyCO- cyclobutyl RaCOO-2-PyCO- cyclopentyl RaCOO-2-PyCO- phenyl RaCOO-3PyCO- 2-furyl RaCOO-3-PyCO- 3-furyl RaCOO-3-PyCO- 2-thienyl RaCOO-3-PyCO- 3-thienyl RaCOO-3-PyCO- 2-pyridyl RaCOO-3-PyCO- 3-pyridyl RaCOO-3-PyCO- 4-pyridyl RaCOO-3-PyCO- isobutenyl RaC00-3-PyCO- isopropyl RaCOO-3-PyCO- cyclopropyl RaCOO-3-PyCO- cyclobutyl RaCOO-3-PyCO- cyclopentyl RaCOO-3-PyCO- phenyl RaCOO-4-PyCO- 2-fu ryl RaCOO-4-PyCO- 3-furyl RaCOO-4-PyCO- 2-thienyl RaCOO-4-PyCO- 3-thienyl RaCOO-4-PyCO- 2-pyridyl RaCOO-4-PyCO- 3-pyridyl RaCOO-4-PyCO- 4-pyridyl RaCOO-4-PyCO- isobutenyl RaCOO-4-PyCO- isopropyl RaCOO-4-PyCO- cyclopropyl RaCOO-4-PyCO- cyclobutyl RaCOO-4-PyCO- cyclopentyl RaCOO-4-PyCO- phenyl RaCOO-C4H7CO- 2-furyl RaCOO-C4H7C0- 3-furyl RaCOO-C4H7CO- 2-thienyl RaCOO-C4H7CO- 3-thienyl RaCOO-C4H7CO- 2-pyridyl RaCOO-C4H7CO- 3-pyridyl RaCOO-C4H7CO- 4-pyridyl RaCOO-C4H7CO- isobutenyl RaCOO-C4H7CO- isopropyl RaCOO-C4H7CO- cyclopropyl RaCOO-C4H7CO- cyclobutyl RaCOO-C4H7CO- cyclopentyl RaCOO-C4H7CO- phenyl RaCO0-EtOCO- 2-furyl RaCOO-EtOCO- 3-furyl RaCOO-EtOCO- 2-thienyl RaCOO-EtOCO- 3-thienyl RaCOO-EtOCO- 2-pyridyl RaCOO-EtOCO- 3-pyridyl RaCOO-EtOCO- 4-pyridyl RaCOO-EtOCO- isobutenyl RaCOO-EtOCO- isopropyl RaCOO-EtOCO- cyclopropyl RaCOO-EtOCO- cyclobutyl RaCOO-EtOCO- cyclopentyl RaCOO-EtOCO- phenyl RaCOO-ibueCO- 2-furyl RaCOO-ibueCO- 3-furyl RaCOO-ibueCO- 2-thienyl RaCOO-ibueCO- 3-thienyl RaCOO-ibueCO- 2-pyridyl RaCOO-ibueCO- 3-pyridyl RaCOO-ibueCO- 4-pyridyl RaCOO-ibueCO- isobutenyl RaCOO-ibueCO- isopropyl RaCOO-ibueCO- cyclopropyl RaCOO-ibueCO- cyclobutyl RaCOO-ibueCO- cyclopentyl RaCOO-ibueCO- phenyl RaCOO-iBuCO- 2-furyl RaCOO-iBUCO- 3-furyl RaCOO-iBuCO- 2-thienyl RaCOO-iBuCO- 3-thienyl RaCOO-iBuCO- 2-pyridyl RaCOO-iBuCO- 3-pyridyl RaCOO-5 iBuCO- 4-pyridyl RaCOO-iBuCO- isobutenyl RaCOO-iBuCO- isopropyl RaCOO-iBuCO- cyclopropyl RaCOO-iBUCO- cyclobutyl RaCOO-10 iBuCO- cyclopentyl RaCOO-iBuCO- phenyl RaCOO-iBuOCO- 2-furyl RaCOO-iBUOCO- 3-furyl RaCOO-iBuOCO- 2-thienyl RaCOO-15 iBuOCO- 3-thienyl RaCOO-iBUOCO- 2-pyridyl RaCOO-iBUOCO- 3-pyridyl RaCOO-iBuOCO- 4-pyridyl RaCOO-iBuOCO- isobutenyl RaCOO-20 iBuOCO- isopropyl RaCOO-iBuOCO- cyclopropyl RaCOO-iBUOCO- cyclobutyl RaCOO-iBuOCO- cyclopentyl RaCOO-iBuOCO- phenyl RaCOO-25 iPrOCO- 2-furyl RaCOO-iPrOCO- 3-furyl RaCOO-iPrOCO- 2-thienyl RaCOO-iPrOCO- 3-thienyl RaCOO-iPrOCO- 2-pyridyl RaCOO-30 iPrOCO- 3-pyridyl RaCOO-iPrOCO- 4-pyridyl RaCOO-iPrOCO- isobutenyl RaCOO-iPrOCO- isopropyl RaCOO-iPrOCO- cyclopropyl RaCOO-iPrOCO- cyclobutyl RaCOO-iPrOCO- cyclopentyl RaCO0-iPrOCO- phenyl RaCOO-nPrOCO- 2-furyl RaCO0-nPrOCO- 3-furyl RaCOO-nPrOCO- 2-thienyl RaCO0-nPrOCO- 3-thienyl RaCOO-nPrOCO- 2-pyridyl RaCOO-nPrOCO- 3-pyridyl RaCOO-nPrOCO- 4-pyridyl RaC00-nPrOCO- isobutenyl RaCOO-nPrOCO- isopropyl RaCOO-nPrOCO- cyclopropyl RaCOO-nPrOCO- cyclobutyl RaCOO-nPrOCO- cyclopentyl RaCOO-nPrOCO- phenyl RaCO0-nPrCO- 2-furyl RaC00-nPrCO- 3-furyl RaCOO-nPrCO- 2-thienyl RaCOO-nPrCO- 3-thienyl RaCOO-nPrCO- 2-pyridyl RaCOO-nPrCO- 3-pyridyl RaCOO-nPrCO- 4-pyridyl RaCOO-nPrCO- isobutenyl RaCOO-nPrCO- isopropyl RaCOO-nPrCO- cyclopropyl RaC00-nPrCO- cyclobutyl RaCO0-nPrCO- cyclopentyl RaCOO-nPrCO- phenyl RaCOO-tBuOCO- cyclopentyl EtCOO-benzoyl 3-furyl EtC00-benzoyl 2-thienyl EtCOO-benzoyl 2-pyridyl EtCOO-benzoyl 3-pyridyl EtCOO-benzoyl 4-pyridyl EtCOO-benzoyl isobutenyl EtCOO-benzoyl isopropyl EtCOO-benzoyl cyclopropyl EtCOO-benzoyl cyclobutyl EtCOO-benzoyl cyclopentyl EtCOO-benzoyl phenyl EtCOO-2-FuCO- 3-furyl EtCOO-2-FuCO- 3-thienyl EtCOO-2-FuCO- 2-pyridyl EtCOO-2-FuCO- 3-pyridyl EtCOO-2-FuCO- 4-pyridyl EtC00-2-FuCO- isobutenyl EtCOO-2-FuCO- isopropyl EtCOO-2-FuCO- cyclopropyl EtCOO-2-FuCO- cyclobutyl EtCOO-2-FuCO- cyclopentyl EtCOO-2-FuCO- phenyl EtCOO-2-ThCO- 3-furyl EtCOO-2-ThCO- 3-thienyl EtCOO-2-ThCO- 2-pyridyl EtCOO-2-ThCO- 3-pyridyl EtCOO-2-ThCO- 4-pyridyl EtCOO-2-ThCO- isobutenyl EtCOO-2-ThCO- isopropyl EtCOO-2-ThCO- cyclopropyl EtCO0-2-ThCO- cyclobutyl EtCOO-2-ThCO- cyclopentyl EtCOO-2-ThCO- phenyl EtC00-2-PyCO- 2-furyl EtCOO-2-PyCO- 3-furyl EtCOO-2-PyCO- 2-thienyl EtCOO-2-PyCO- 3-thienyl EtCOO-2-PyCO- 2-pyridyl EtCOO-2-PyCO- 3-pyridyl EtCOO-2-PyCO- 4-pyridyl EtCOO-2-PyCO- isobutenyl EtCOO-2-PyCO- isopropyl EtCOO-2-PyCO- cyclopropyl EtCOO-2-PyCO- cyclobutyl EtCOO-2-PyCO- cyclopentyl EtCOO-2-PyCO- phenyl EtCOO-3PyCO- 2-furyl EtCOO-3-PyCO- 3-furyl EtCOO-3-PyCO- 3-thienyl EtCOO-3-PyCO- 2-pyridyl EtCOO-3-PyCO- 3-pyridyl EtCOO-3-PyCO- 4-pyridyl EtCOO-3-PyCO- isobutenyl EtCOO-3-PyCO- isopropyl EtCOO-3-PyCO- cyclopropyl EtCOO-3-PyCO- cyclobutyl EtCOO-3-PyCO- cyclopentyl EtCOO-3-PyCO- phenyl EtCOO-4-PyCO- 2-furyl EtCOO-4-PyCO- 3-furyl EtCOO-WO 01/57027 PCT/USOl/03385 4-PyCO- 2-thienyl EtCOO-4-PyCO- 3-thienyl EtCOO-4-PyCO- 2-pyridyl EtCOO-4-PyCO- 3-pyridyl EtCOO-4-PyCO- 4-pyridyl EtCOO-4-PyCO- isobutenyl EtCOO-4-PyCO- isopropyl EtCOO-4-PyCO- cyclopropyl EtCOO-4-PyCO- cyclobutyl EtCOO-4-PyCO- cyclopentyl EtCOO-4-PyCO- phenyl EtCOO-C4H7CO- 3-furyl EtCOO-C4H7CO- 3-thienyl EtCOO-C4H7CO- 2-pyridyl EtCOO-C4H7CO- 3-pyridyl EtCOO-C4H7CO- 4-pyridyl EtCOO-C4H7CO- isobutenyl EtCOO-C4H7CO- isopropyl EtCOO-C4H7CO- cyclopropyl EtCOO-C4H7CO- cyclobutyl EtCOO-C4H7CO- cyclopentyl EtCOO-C4H7CO- phenyl EtCOO-EtOCO- 3-furyl EtCOO-EtOCO- 3-thienyl EtCOO-EtOCO- 2-pyridyl EtCOO-EtOCO- 3-pyridyl EtCOO-EtOCO- 4-pyridyl EtCOO-EtOCO- isobutenyl EtCOO-EtOCO- isopropyl EtCOO-EtOCO- cyclopropyl EtCOO-EtOCO- cyclobutyl EtCOO-EtOCO- cyclopentyl EtC00-EtOCO- phenyl EtCOO-ibueCO- 2-furyl EtCOO-ibueCO- 3-furyl EtCOO-5 ibueCO- 2-thienyl EtC00-ibueCO- 3-thienyl EtC00-ibueCO- 2-pyridyl EtCOO-ibueCO- 3-pyridyl EtCOO-ibueCO- 4-pyridyl EtCOO-10 ibueCO- isobutenyl EtCOO-ibueCO- isopropyl EtCOO-ibueCO- cyclopropyl EtCOO-ibueCO- cyclobutyl EtCOO-ibueCO- cyclopentyl EtCOO-15 ibueCO- phenyl EtCOO-iBuCO- 2-furyl EtCOO-iBuCO- 3-furyl EtCOO-iBuCO- 2-thienyl EtCOO-iBuCO- 3-thienyl EtCOO-20 iBuCO- 2-pyridyl EtCOO-iBuCO- 3-pyridyl EtCOO-iBuCO- 4-pyridyl EtCOO-iBuCO- isobutenyl EtCOO-iBuCO- isopropyl EtCOO-25 iBuCO- cyclopropyl EtCOO-iBuCO- cyclobutyl EtCOO-iBuCO- cyclopentyl EtCOO-iBuCO- phenyl EtCOO-iBuOCO- 2-pyridyl EtCOO-30 iBuOCO- 3-pyridyl EtCOO-iBuOCO- 4-pyridyl EtCOO-iBuOCO- isobutenyl EtC00-iBuOCO- isopropyl EtCOO-iBuOCO- cyclobutyl EtCOO-iBuOCO- cyclopentyl EtCOO-iBuOCO- phenyl EtCOO-iPrOCO- 3-furyl EtCOO-iPrOCO- 3-thienyl EtCOO-iPrOCO- 2-pyridyl EtCO0-iPrOCO- 3-pyridyl EtC00-iPrOCO- 4-pyridyl EtCO0-iPrOCO- isobutenyl EtCOO-iPrOCO- isopropyl EtCOO-iPrOCO- cyclopropyl EtCOO-iPrOCO- cyclobutyl EtCOO-iPrOCO- cyclopentyl EtCOO-iPrOCO- phenyl EtCOO-nPrOCO- 2-furyl EtCOO-nPrOCO- 3-furyl EtCOO-nPrOCO- 2-thienyl EtCOO-nPrOCO- 3-thienyl EtCOO-nPrOCO- 2-pyridyl EtCOO-nPrOCO- 3-pyridyl EtCO0-nPrOCO- 4-pyridyl EtCOO-nPrOCO- isobutenyl EtCOO-nPrOCO- isopropyl EtCOO-nPrOCO- cyclopropyl EtCOO-nPrOCO- cyclobutyl EtCOO-nPrOCO- cyclopentyl EtCOO-nPrOCO- phenyl EtC00-nPrCO- 3-furyl EtCOO-nPrCO- 3-thienyl EtCOO-nPrCO- 2-pyridyl EtCOO-nPrCO- 3-pyridyl EtCOO-nPrCO- 4-pyridyl EtCOO-nPrCO- isobutenyl EtCOO-nPrCO- isopropyl EtCOO-nPrCO- cyclopropyl EtCOO-nPrCO- cyclobutyl EtCOO-nPrCO- cyclopentyl EtCOO-nPrCO- phenyl EtCOO-Example 4 Following the processes described in Example 1 and elsewhere herein, the following specific taxanes having structural formula 15 may be prepared, wherein R,o is hydroxy and R7 in each of the series (that is, each of series "A"
through "K") is as previously defined, including wherein R7 is R7aCOO- and R7a is (i) substituted or unsubstituted, preferably unsubstituted, Cz to C$ alkyl (straight, branched or cyclic), such as ethyl, propyl, butyl, pentyl, or hexyl; (ii) substituted or unsubstituted, preferably unsubstituted, C2 to C8 alkenyl (straight, branched or cyclic), such as ethenyl, propenyl, butenyl, pentenyl or hexenyl; (iii) substituted or unsubstituted, preferably unsubstituted, C2 to C8 alkynyl (straight or branched) such as ethynyl, propynyl, butynyl, pentynyl, or hexynyl; (iv) substituted or unsubstituted, preferably unsubstituted, phenyl; or (v) substituted or unsubstituted, preferably unsubstituted, heteroaromatic such as furyl, thienyl, or pyridyl.
In the "A" series of compounds, X,o is as otherwise as defined herein.
Preferably, heterocyclo is substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), and R, and R,o each have the beta stereochemical configuration.
In the "B" series of compounds, X,o and Rza are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7 and R,o each have the beta stereochemical configuration.

In the "C" series of compounds, X,o and R9a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R9a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R,o each have the beta stereochemical configuration.
In the "D" and "E" series of compounds, X,o is as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), and R7, R. (series D only) and R,o each have the beta stereochemical configuration.
In the "F" series of compounds, X,o, R2a and R9a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R,o each have the beta stereochemical configuration.
In the "G" series of compounds, X,o and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R,o each have the beta stereochemical configuration.
In the "H" series of compounds, X,o is as otherwise as defined herein.
Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7 and R,o each have the beta stereochemical configuration.
In the "I" series of compounds, X,o and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7 and R,o each have the beta stereochemical configuration.
In the "J" series of compounds, X,o and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X,o is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and Rlo each have the beta stereochemical configuration.
In the "K" series of compounds, X,o, R2a and R9a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, XIo is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R,o each have the beta stereochemical configuration.
Any substituents of each X3, X5, R2, R7, and R. may be hydrocarbyl or any of the heteroatom containing substituents selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.

X5NH O Rlo R9 X3~O~

OH R14 HO =

OAc (15) Series X5 X3 R7 R2 R9 R,a Al -COOX,o heterocyclo R7aC00- C6H5COO- 0 H
A2 -COX,o heterocyclo R7aC00- C6H5CO0- 0 H
A3 -CONHX10 heterocyclo R7aCOO- C6H5COO- 0 H
A4 -COOX,o optionally R,aCOO- C6H5COO- 0 H
substituted C2 to C8 alkyl A5 -COX,o optionally R7aC00- C6H5CO0- 0 H
substituted C2 to C$ alkyl A6 -CONHX,o optionally R,aCOO- C6H5CO0- 0 H
substituted C2 to C8 alkyl A7 -COOX,o optionally R7aC00- C6H5CO0- 0 H
substituted C2 to C8 alkenyl A8 -COX,o optionally R7aCOO- C6H5CO0- 0 H
substituted C2 to C8 alkenyl A9 -CONHX,o optionally R7aCOO- C6H5CO0- 0 H
substituted C2 to C8 alkenyl 5 A10 -COOX,o optionally R7aCOO- C6H5CO0- 0 H
substituted C2 to C8 alkynyl A11 -COX,o optionally R7aCOO- C6H5CO0- 0 H
substituted C2 to C8 alkynyl A12 -CONHX,o optionally R7aCOO- C6H5CO0- 0 H
substituted CZ to C8 alkynyl B1 -COOX,o heterocyclo R7aC00- R2aC00- 0 H
B2 -COX,o heterocyclo R7aCOO- R2aCOO- 0 H
10 B3 -CONHX,o heterocyclo R7aCOO- R2aCOO- 0 H
B4 -COOX,o optionally R7aCOO- R2aC00- 0 H
substituted C2 to C8 alkyl B5 -COX,o optionally R7aCOO- RzaCOO- 0 H
substituted C2 to Ca alkyl B6 -CONHX,o optionally R7aCOO- R2aC00- 0 H
substituted Cz to C$ alkyl B7 -COOX,o optionally R7aC00- R2aC00- 0 H
substituted C2 to C8 alkenyl B8 -COX,o optionally R7aCOO- R2aCOO- 0 H
substituted C2 to C8 alkenyl B9 -CONHX,o optionally R7aCOO- R2aCOO- 0 H
substituted C2 to C8 alkenyl B10 -COOX,o optionally R7aCOO- R2aC00- 0 H
substituted C2 to C8 alkynyl B11 -COX,o optionally R7aCOO- R2aC00- 0 H
substituted C2 to C8 alkynyl B12 -CONHX,o optionally R,aCOO- R2aCOO- 0 H
substituted C2 to C8 alkynyl C1 -COOX,o heterocyclo R7aC00- C6H5CO0- R9aCOO- H
C2 -COX,o heterocyclo R,aCOO- C6H5CO0- R9aCOO- H
C3 -CONHX,o heterocyclo R7aCO0- C6H5COO- R9aCOO- H
C4 -COOX,o optionally R7aC00- C6H5CO0- R9aC00- H
substituted C2 to C8 alkyl C5 -COX,o optionally R,aCOO- C6H5CO0- R9aCOO- H
substituted C2 to C8 alkyl C6 -CONHX,o optionally R7aCOO- C6H5CO0- R9aCOO- H
substituted C2 to C8 alkyl C7 -COOX,o optionally R7aCOO- C6H5CO0- R9aCOO- H
substituted C2 to C8 alkenyl C8 -COX,o optionally R7aC00- C6H5CO0- R9aCOO- H
substituted C2 to C8 alkenyl C9 -CONHX,o optionally R7aCOO- C6H5COO- R9aCOO- H
substituted C2 to C8 alkenyl C10 -COOX,o optionally R,aCOO- C6H5COO- R9aCOO- H
substituted C2 to C$
alkynyl C11 -COX,o optionally R7aCOO- C6H5CO0- R9aCOO- H
substituted C2 to C8 alkynyl C12 -CONHX,o optionally R7aC00- C6H5CO0- R9aCOO- H
substituted C2 to C8 alkynyl Dl -COOX,o heterocyclo R7aCOO- C6H5CO0- OH H
D2 -COX,o heterocyclo R7aCOO- C6H5COO- OH H
D3 -CONHX,o heterocyclo R7aCOO- C6H5COO- OH H
D4 -COOX,o optionally R7aCOO- C6H5COO- OH H
substituted C2 to C$ alkyl D5 -COX,o optionally R,aCOO- C6H5COO- OH H
substituted C2 to Ca alkyl D6 -CONHX,o optionally R7aCOO- C6H5COO- OH H
substituted Cz to C$ alkyl D7 -COOX,o optionally R7aCOO- C6H5COO- OH H
substituted C2 to C8 alkenyl D8 -COX,o optionally R7aCOO- C6H5COO- OH H
substituted C2 to C8 alkenyl D9 -CONHX,o optionally R7aCOO- C6H5COO- OH H
substituted C2 to C8 alkenyl D10 -COOX,o optionally R7aC00- C6H5COO- OH H
substituted C2 to C8 alkynyl D11 -COX,o optionally R,aCOO- C6H5CO0- OH H
substituted C2 to C8 alkynyl D12 -CONHX,o optionally R,aCOO- C6H5CO0- OH H
substituted CZ to C8 alkynyl El -COOX,o heterocyclo R7aC00- C6H5COO- 0 OH
E2 -COX10 heterocyclo R7aCOO- C6H5COO- 0 OH
E3 -CONHX,o heterocyclo R7aC00- C6H5CO0- 0 OH
E4 -COOX,o optionally R7aCOO- C6H5CO0- 0 OH
substituted C2 to C$ alkyl E5 -COX10 optionally R,aCOO- C6H5COO- 0 OH
substituted C2 to C8 alkyl E6 -CONHX,o optionally R7aC00- C6H5COO- 0 OH
substituted C2 to C8 alkyl E7 -COOX,o optionally R7aC00- C6H5COO- 0 OH
substituted C2 to C8 alkenyl E8 -COX,o optionally R7aCOO- C6H5CO0- 0 OH
substituted C2 to C8 alkenyl E9 -CONHX,o optionally R7aC00- C6H5CO0- 0 OH
substituted Cz to C8 alkenyl E10 -COOX,o optionally R7aCOO- C6H5COO- 0 OH
substituted CZ to C8 alkynyl E11 -COX,o optionally R7aC00- C6H5CO0- 0 OH
substituted C2 to C8 alkynyl E12 -CONHX,o optionally R,aCOO- C6H5CO0- 0 OH
substituted C2 to C8 alkynyl Fl -COOX10 heterocyclo R7aC00- RzaCOO- R9aCOO- H
F2 -COX,o heterocyclo R7aC00- R2aC00- R9aC00- H
F3 -CONHX,o heterocyclo R7aCOO- R2aCOO- R9aC00- H
F4 -COOX,o optionally R7aC00- R2aC00- R9aCOO- H
substituted CZ to C8 alkyl F5 -COX,o optionally R7aC00- R2aCOO- R9aC00- H
substituted C2 to C8 alkyl F6 -CONHX,o optionally R7aC00- R2aC00- R9aC00- H
substituted C2 to C8 alkyl F7 -COOX,o optionally R7aCOO- R2aC00- R9aC00- H
substituted C2 to C8 alkenyl F8 -COX,o optionally R7aC00- R2aC00- R9aC00- H
substituted C2 to C$
alkenyl F9 -CONHX,o optionally R7aCOO- RzaCOO- R9aC00- H
substituted C2 to C8 alkenyl F10 -COOX,o optionally R7aCOO- R2aCOO- R9aCOO- H
substituted C2 to C8 alkynyl F11 -COX10 optionally R,aCOO- R2aC00- R9aC00- H
substituted C2 to C$
alkynyl F12 -CONHX,o optionally R,aCOO- R2aCOO- R9aC00- H
substituted C2 to C$
alkynyl G1 -COOX,o heterocyclo R7aCOO- R2aCOO- OH H
G2 -COX,o heterocyclo R7aCOO- R2aCOO- OH H
G3 -CONHX,o heterocyclo R7aCOO- R2aCOO- OH H
5 G4 -COOX,o optionally R7aCOO- R2aC00- OH H
substituted C2 to C. alkyl G5 -COX,o optionally R7aCOO- R2aC00- OH H
substituted Cz to C8 alkyl G6 -CONHX,o optionally R7aCOO- R2aCOO- OH H
substituted C2 to C$ alkyl G7 -COOX,o optionally R,aCOO- R2aCOO- OH H
substituted C2 to C8 alkenyl G8 -COX,o optionally R7aC00- R2aCOO- OH H
substituted C2 to C8 alkenyl 10 G9 -CONHX,o optionally R,aCOO- R2aCOO- OH H
substituted C2 to C8 alkenyl G10 -COOX,o optionally R7aCOO- R2aCOO- OH H
substituted C2 to C8 alkynyl G11 -COX,o optionally R7aCOO- R2aC00- OH H
substituted C2 to C8 alkynyl G12 -CONHX,o optionally R,aCOO- R2aCOO- OH H
substituted C2 to C8 alkynyl H1 -COOX,o heterocyclo R7aCOO- C6H5COO- OH OH
15 H2 -COX,o heterocyclo R7aCOO- C6H5COO- OH OH

H3 -CONHX10 heterocyclo R,aCOO- C6H5CO0- OH OH
H4 -COOX,o optionally R,aCOO- C6H5CO0- OH OH
substituted C2 to C8 alkyl H5 -COX,o optionally R,aCOO- C6H5CO0- OH OH
substituted C2 to Cs alkyl H6 -CONHX,o optionally R7aCOO- C6H5COO- OH OH
substituted C2 to C$ alkyl H7 -COOX,o optionally R7aCOO- C6H5COO- OH OH
substituted C2 to C8 alkenyl H8 -COX,o optionally R7aCOO- C6H5CO0- OH OH
substituted C2 to C8 alkenyl H9 -CONHX,o optionally R7aCOO- C6H5CO0- OH OH
substituted C2 to C8 alkenyl H10 -COOX,o optionally R7aCOO- C6H5COO- OH OH
substituted C2 to C8 alkynyl H11 -COX,o optionally R7aCOO- C6H5COO- OH OH
substituted C2 to C8 alkynyl H12 -CONHX,o optionally R7aCOO- C6H5COO- OH OH
substituted C2 to C8 alkynyl 11 -COOX10 heterocyclo R7aCOO- R2aCOO- 0 OH
12 -COX,o heterocyclo R7aCOO- RZaCOO- 0 OH
13 -CONHX,o heterocyclo R,aCOO- RzaCOO- 0 OH
14 -COOX10 optionally R7aCOO- R2aCOO- 0 OH
substituted C2 to C$ alkyl 15 -COX,o optionally R7aC00- R2aC00- 0 OH
substituted C2 to C$ alkyl 16 -CONHX,o optionally R7aCOO- R2aC00- 0 OH
substituted CZ to C$ alkyl 17 -COOX,o optionally R7aC00- R2aCO0- 0 OH
substituted C2 to C8 alkenyl 18 -COX,o optionally R7aCOO- R2aCOO- 0 OH
substituted C2 to C8 alkenyl 19 -CONHX,o optionally R7aCOO- R2aC00- 0 OH
substituted C2 to C8 alkenyl 110 -COOX,o optionally R7aCOO- R2aCOO- 0 OH
substituted C2 to C8 alkynyl Ill -COX,o optionally R7aCOO- R2aC00- 0 OH
substituted C2 to C8 alkynyl 112 -CONHX,o optionally R7aCOO- R2aC00- 0 OH
substituted C2 to C8 alkynyl J1 -COOX,o heterocyclo R7aC00- R2aCOO- OH OH
J2 -COX,o heterocyclo R7aC00- R2aCOO- OH OH
J3 -CONHX,o heterocyclo R7aCOO- R2aCOO- OH OH
J4 -COOX10 optionally R7aCOO- R2aC00- OH OH
substituted C2 to C$ alkyl J5 -COX,o optionally R7aCOO- RZaC00- OH OH
substituted C2 to C$ alkyl J6 -CONHX,o optionally R7aCOO- R2aC00- OH OH
substituted C2 to C$ alkyl J7 -COOX,o optionally R7aCOO- R2aC00- OH OH
substituted Cz to C8 alkenyl J8 -COX,o optionally R7aC00- R2aC00- OH OH
substituted C2 to C$
alkenyl J9 -CONHX,o optionally R7aCOO- R2aCOO- OH OH
substituted C2 to C8 alkenyl J10 -COOX,o optionally R7aCOO- R2aC00- OH OH
substituted C2 to C8 alkynyl J11 -COX,o optionally R7aCOO- R2aCOO- OH OH
substituted C2 to C8 alkynyl J12 -CONHX,o optionally R7aCOO- R2aC00- OH OH
substituted C2 to C8 alkynyl K1 -COOX,o heterocyclo R7aC00- R2aCOO- R9aC00- OH
K2 -COX,o heterocyclo R7aC00- R2aC00- R9aC00- OH
K3 -CONHX,o heterocyclo R7aC00- R2aC00- R9aC00- OH
K4 -COOX,o optionally R7aC00- R2aC00- R9aC00- OH
substituted C2 to Ca alkyl K5 -COX,o optionally R7aCOO- R2aC00- R9aC00- OH
substituted C2 to C$ alkyl K6 -CONHX,o optionally R7aCOO- RzaCOO- R9aCOO- OH
substituted CZ to Cg alkyl K7 -COOX,o optionally R7aC00- R2aC00- R9aCOO- OH
substituted C2 to C$
alkenyl K8 -COX,o optionally R7aC00- R2aCOO_ R9aCOO- OH
substituted C2 to C8 alkenyl K9 -CONHX10 optionally R7aCOO- R221C00- R9aCOO- OH
substituted Cz to C$
alkenyl K10 -COOX10 optionally R7aCOO- R2aCOO_ R9aC00- OH
substituted C2 to C8 alkynyl K11 -COX10 optionally R7aCOO- R2aCOO_ R9aC00- OH
substituted C2 to C8 alkynyl K12 -CONHX,o optionally R,aCOO- R2aCOO_ R9aC00- OH
substituted C2 to C8 alkynyl Example 5 In Vitro cytotoxicity measured by the cell colony formation assay Four hundred cells (HCT116) were plated in 60 mm Petri dishes containing 2.7 mL of medium (modified McCoy's 5a medium containing 10% fetal bovine serum and 100 units/mL penicillin and 100 g/mL streptomycin). The cells were incubated in a C02 incubator at 37 C for 5 h for attachment to the bottom of Petri dishes. The compounds identified in Example 2 were made up fresh in medium at ten times the final concentration, and then 0.3 mL of this stock solution was added to the 2.7 mL of medium in the dish. The cells were then incubated with drugs for 72 h at 37 C. At the end of incubation the drug-containing media were decanted, the dishes were rinsed with 4 mL of Hank's Balance Salt Solution (HBSS), 5 mL of fresh medium was added, and the dishes were returned to the incubator for colony formation. The cell colonies were counted using a colony counter after incubation for 7 days. Cell survival was calculated and the values of ID50 (the drug concentration producing 50% inhibition of colony formation) were determined for each tested compound.

Compound IN VITRO
ID 50 (nm) HCT116 taxol 2.1 docetaxel 0.6 1351 <1 5 1364 <10 1372 26.1 1386 <1 1393 <1 1401 <1 10 1418 <1 1424 <1 1434 <10 1447 <10 1458 <10 15 3069 <1 3082 <1 3171 <1 3196 <10 3232 <1 20 3327 <10 3388 <10 3444 <1 3479 <1 3555 <10 25 3560 <1 3611 <1 3629 <1 3632 <1 3708 <1 3713 <10 4017 <10 4044 <1 4106 <10 4135 <1 4175 <10 4219 29.0 4256 <1 4283 <1 4290 <10 4312 <1 4388 <1 4394 <1 4406 <1 4446 <1 4499 <1 4544 <10 4600 <10 4616 <1 4737 <1 4757 <1 6171 <10 6131 <1 5989 <10 6141 <1 6181 <1 6040 <10 6121 <10 6424 21.7 6212 <1 6282 <10 6252 <1 6343 <10 6272 <1 6202 <1 4454 <1 4414 <1 6333 <1 6686 <1 6363 <10 4787 <10 4828 <10 4898 <1 4939 <1 5020 <1 5030 <1 5191 <10 5202 <10 5070 <10 5080 <1 5121 21.1 5131 <10 Example 6 Preparation of Solutions for Oral Administration Solution 1: Antitumor compound 1393 was dissolved in ethanol to form a solution containing 140 mg of the compound per ml of solution. An equal volume of Cremophor EL solution was added to the solution while stirring to form a solution containing 70 mg of compound 1393 per ml. This solution was diluted using 9 parts by weight of saline to form a pharmaceutically acceptable solution for administration to a patient.

Solution 2: Antitumor compound 1458 was dissolved in ethanol to form a solution containing 310 mg of the compound per ml of solution. An equal volume of Cremophor EL solution was added to the solution while stirring to form a solution containing 155 mg of compound 1458 per ml. This solution was diluted using 9 parts by weight of saline to form a pharmaceutically acceptable solution for administration to a patient.

Solution 3: Antitumor compound 1351 was dissolved in ethanol to form a solution containing 145 mg of the compound per ml of solution. An equal volume of Cremophor EL solution was added to the solution while stirring to form a solution containing 72.5 mg of compound 1351 per ml. This solution was diluted using 9 parts by weight of saline to form a pharmaceutically acceptable solution for administration to a patient.

Solution 4: Antitumor compound 4017 was dissolved in ethanol to form a solution containing 214 mg of the compound per ml of solution. An equal volume of Cremophor EL solution was added to the solution while stirring to form a solution containing 107 mg of compound 4017 per ml. This solution was diluted using 9 parts by weight of saline to form a pharmaceutically acceptable solution for administration to a patient.

Solution 5: Antitumor compound 1393 was dissolved in 100% ethanol then mixed with an equal volume of Cremophor EL solution to form a solution containing mg of compound 1393 per ml. This solution was diluted using 9 parts by weight of D%W (an aqueous solution containing 5 % weight by volume of dextrose) or 0.9% saline to form a pharmaceutically acceptable solution for administration to a patient.

Example 7 Preparation of a Suspension Containing Compound 1393 for Oral Administration An oral composition of antitumor compound 1393 was prepared by suspending 25 mg of compound 1393 as a fine powder in one ml of carrier containing 1% carboxymethylcellulose (CMC) in deionized water.

Example 8 Preparation of a Tablet Containing Compound 1393 for Oral Administration Antitumor compound 1393 (100 mg) was dissolved in methylene chloride (2 ml) and Cremophor EL solution (100mg) was added. The methylene chloride was evaporated under vacuum to form a glass. Microcrystalline cellulose (600 mg) was added to the glass and mixed to form a powder which can be processed to form a tablet.

Example 9 Preparation of Emulsions Containing Compound 1393 for Parenteral Administration Emulsion 1: Antitumor compound 1393 was dissolved in 100% ethanol to form a solution containing 40 mg of compound 1393 per ml of the solution. The solution was then diluted with 19 parts by weight of Liposyn II (20%) with stirring to form an emulsion containing 2 mg of compound 1393 per ml for parenteral administration.

Emulsion 2: Antitumor compound 1393 was dissolved in 100% ethanol to form a solution containing 40 mg of compound 1393 per ml of the solution. The solution was then diluted with 19 parts by weight of Liposyn III (2%) with stirring to form an emulsion containing 2 mg of compound 1393 per ml for parenteral administration.

Emulsion 3: Antitumor compound 1393 was dissolved in 100% ethanol to form a solution containing mg of compound 1393 per ml of the solution. The solution was then diluted with 9 parts by weight of Liposyn 111 (2%) with stirring to form an emulsion containing 4 mg of compound 1393 per ml for parenteral administration.

Example 10 Preparation of Solutions Containing Compound 1393 for Parenteral Administration Solution 1: Antitumor compound 1393 was dissolved in 100% ethanol to form a 5 solution containing 140 mg of compound 1393 per mi. The solution was then diluted with an equal volume of Cremophor EL solution with stirring and was then diluted with 9 parts by weight of normal saline to form a solution containing 7 mg of compound 1393 per ml of solution for parenteral administration.

Solution 2: Antitumor compound 1393 was dissolved in 100% ethanol to form a 10 solution containing 140 mg of compound 1393 per ml of the solution. The solution was then diluted with an equal volume of Cremophor EL solution with stirring and was then diluted with 4 parts by weight of normal saline to form a solution containing 11.7 mg of compound 1393 per ml of solution for parenteral administration.

15 Solution 3: Antitumor compound 1393 was dissolved in 100% ethanol to form a solution containing 140 mg of compound 1393 per ml of the solution. The solution was then diluted with an equal volume of Cremophor EL solution with stirring and was then diluted with 2.33 parts by weight of normal saline to form a solution containing 16.2 mg of compound 1393 per ml of solution for parenteral 20 administration.

Claims (54)

CLAIMS:

1. A taxane having the general formula:

wherein:

R2 is benzoyloxy;
R7 i s R7a COO - ;

R10 is hydroxy;

X3 is unsubstituted C1-C8 alkyl, C3-C8 cycloalkyl, C2-C8 alkenyl, furyl, or thienyl;

X5 is -COX10, or -COOX10;

X10 is unsubstituted C1-C8 alkyl, C3-C8 cycloalkyl, C2-C8 alkenyl, phenyl, furyl, or thienyl;

R7a is unsubstituted C2-C8 alkyl or C3-C8 cycloalkyl; and Ac is acetyl.

2. The taxane of claim 1, wherein X3 is 2-furyl, 3-furyl, 2-thienyl, or 3-thienyl.

3. The taxane of claim 2, wherein X3 is 2-furyl or 2-thienyl.

4. The taxane of claim 1, wherein X3 is C3-C8 cycloalkyl.

5. The taxane of claim 1, wherein X3 is isobutenyl.

6. The taxane of any one of claims 1 to 5, wherein X5 is -COX10 and X10 is phenyl, 2-furyl, 3-furyl, 2-thienyl, 3-thienyl, C1-C8 alkyl, or C2-C8 alkenyl, or X5 is -COOX10 and X10 is C1-C8 alkyl, or C2-C8 alkenyl.

7. The taxane of claim 6, wherein X5 is -COX10 and X10 is phenyl, or X5 is - COOX10 and X10 is t- butyl .

8. The taxane of any one of claims 1 to 7, wherein R7a is ethyl or propyl.

9. The taxane of claim 1, wherein X3 is furyl or thienyl, R7a is ethyl, and X5 is -COX10 and X10 is phenyl, or X5 is -COOX10 and X10 is t-butyl.

10. The taxane of claim 1, wherein X3 is furyl, R7a is ethyl, and X5 is -COX10 and X10 is phenyl, or X5 is -COOX10 and X10 is t-butyl.

11. The taxane of claim 1, wherein X3 is thienyl, R7a is ethyl, and X5 is -COX10 and X10 is phenyl, or X5 is -COOX10 and X10 is t-butyl.

12. The taxane of claim 1, wherein X3 is isobutenyl, R7a is ethyl, and X5 is -COX10 and X10 is phenyl, or X5 is -COOX10 and X10 is t-butyl.

13. The taxane of claim 1, wherein X3 is C1-C8 alkyl, R7a is ethyl, and X5 is -COX10 and X10 is phenyl, or X5 is -COOX10 and X10 is t-butyl.

14. The taxane of claim 1, wherein X3 is 2-furyl or 2-thienyl, R7a is ethyl, X5 is -COOX10 and X10 is t-butyl.

15. The taxane of claim 1, wherein X3 is 2-furyl, R7a is ethyl, X5 is -COOX10 and X10 is t-butyl.

16. The taxane of claim 1, wherein X3 is 2-thienyl, R7a is ethyl, X5 is -COOX10 and X10 is t-butyl.

17. The taxane of claim 1, wherein X3 is isobutenyl, X5 is - COOX10 and X10 is t-butyl.

18. The taxane of claim 1, wherein X3 is cycloalkyl, R7a is ethyl, X5 is -COOX10 and X10 is t-butyl.

19. The taxane of claim 1, wherein R7a is ethyl or propyl, X5 is -COOX10 and X10 is t-butyl, and X3 is 2-furyl or 3-furyl .

20. The taxane of claim 1, wherein R7a is ethyl or propyl, X5 is -COOX10 and X10 is t-butyl or isobutyl, and X3 is 3-thienyl.

21. The taxane of claim 1, wherein R7a is ethyl or propyl, X5 is -COOX10 and X10 is isopropyl or isobutyl, and X3 is 2-thienyl.

22. The taxane of claim 1, wherein R7a is ethyl, X5 is -COOX10 and X10 is t-butyl, and X3 is isopropyl, isobutenyl, or cyclobutyl.

23. The taxane of claim 1, wherein R7a is ethyl or n-propyl, X5 is -COOX10 and X10 is t-butyl or isobutyl, and X3 is cyclopropyl.

24. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is 2-furyl, or 2-thienyl, and X3 is 2-thienyl.

25. The taxane of claim 1, wherein R7a is propyl or n-propyl, X5 is -COX10 and X10 is 2-furyl or 2-thienyl, and X3 is 2-thienyl.

26. The taxane of claim 1, wherein R7a is ethyl, isobutyl, isopropyl, n-butyl, or n-propyl, X5 is -COOX10 and X10 is isobutenyl, and X3 is 2-furyl.

27. The taxane of claim 1, wherein R7a is isopropyl, X5 is -COX10 and X10 is trans-propenyl or isopropyl, and X3 is 2-furyl.

28. The taxane of claim 1, wherein R7a is propyl, isopropyl, or ethyl, X5 is -COOX10 and X10 is t-butyl, and X3 is 2-thienyl.

29. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is n-propyl or isopropyl, and X3 is 2-furyl.

30. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is phenyl, and X3 is 2-furyl or 3-thienyl.

31. The taxane of claim 1, wherein R7a is ethyl or n-propyl, X5 is -COX10 and X10 is trans-propenyl, and X3 is 3-furyl or 3-thienyl.

32. The taxane of claim 1, wherein R7a is ethyl, or propyl, X5 i s - COOX10 and X10 is isobutyl, and X3 is 2-furyl.

33. The taxane of claim 1, wherein R7a is propyl, X5 is -COOX10 and X10 is t-butyl, and X3 is isobutenyl.

34. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is isobutenyl, butenyl, or trans-propenyl, and X3 is 2-thienyl.

35. The taxane of claim 1, wherein R7a is ethyl, X5 is -COOX10 and X10 is ethyl, and X3 is 2-furyl or 2-thienyl.

36. The taxane of claim 1, wherein R7a is ethyl or n-propyl, X5 is -COOX10 and X10 is isobutyl, and X3 is 3-furyl.

37. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is butenyl, phenyl, or trans-propenyl, and X3 is 2-furyl.

38. The taxane of claim 1, wherein R7a is propyl, X5 is -COX10 and X10 is phenyl, trans-propenyl, or isobutenyl, and X3 is 2-thienyl.

39. The taxane of claim 1, wherein R7a is ethyl, isobutyl, isopropyl, n-butyl, or n-propyl, X5 is -COOX10 and X10 is tert-amyl, and X3 is 2-furyl.

40. The taxane of claim 1, wherein R7a is ethyl or n-propyl, X5 is -COOX10 and X10 is isobutyl, and X3 is isobutenyl.

41. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is 2-furyl or 2-thienyl, and X3 is 2-furyl.

42. The taxane of claim 1, wherein R7a is propyl, X5 is -COX10 and X10 is trans-propenyl, and X3 is 2-furyl.

43. The taxane of claim 1, wherein R7a is ethyl, X5 is -COX10 and X10 is n-propyl, and X3 is 2-thienyl.

44. The taxane of claim 1, wherein R7a is n-propyl, X5 is -COX10 and X10 is phenyl, and X3 is 2-thienyl.

45. The taxane of any one of claims 1 to 5, wherein X5 is -COX10 and X10 is phenyl.

46. The taxane of any one of claims 1 to 5, wherein X5 is -COOX10 and X10 is unsubstituted C1-C8 alkyl or C3-C8 cycloalkyl.

47. The taxane of claim 1, wherein X3 is furyl or thienyl, X5 is -COOX10 and X10 is unsubstituted C1-C8 alkyl or C3-C8 cycloalkyl.

48. A pharmaceutical composition comprising the taxane of any one of claims 1 to 47, and at least one pharmaceutically acceptable carrier.

49. The composition of claim 48, for inhibition of tumor growth in a mammal.

50. Use of the taxane of any one of claims 1 to 47, for inhibition of tumor growth in a mammal.

51. Use of the taxane of any one of claims 1 to 47, in preparation of a medicament for inhibition of tumor growth in a mammal.

52. The taxane of any one of claims 1 to 47, for inhibition of tumor growth in a mammal.

53. A commercial package comprising the taxane of any one of claims 1 to 47, and associated therewith instructions for use thereof in inhibition of tumor growth in a mammal.

54. A commercial package comprising the composition of claim 48, and associated therewith instructions for use thereof in inhibition of tumor growth in a mammal.